Отзывы о Наушники Sennheiser CX 400BT True Wireless

Buenos audifonos, aproveché una promoción de Amazon y me salieron a un muy buen precio

Super buen sonido al escuchar música.. muy buena separación de rangos, si se ecualiza desde la aplicación, se obtienen bajos más profundos sin llegar a ser exagerados, al igual los agudos.
Son muy cómodos y ligeros.
Lo único que no me gustó es que en llamadas telefónicas solo se escucha el auricular derecho..
Pero para su fin principal al menos para mí que es escuchar música, no me afecta demasiado

Muy buenos audifonos, en general tienen un sonido muy bueno, te aislan bien del ruido son relativamente comodos, se llegan a salir si te mueves mucho pero no es frecuente, la bateria les dura bastante y no te lastiman si los tienes 5 horas seguidas, lo unico que es muy dificiente son los microfonos que traen si estas en la calle no te escuchan nada es demasiado el ruido ya sea en una llamada o video llamada.

Lo adquirí con una oferta de Amazon y en color blanco arribita de 2,000 pesos, muy superior a otros y de la calidad de los Premium, no le pide nada a los airpods pro ni Bose, con ese precio para que gastar más teniendo la misma calidad en excelente sonido, aunque repito los compre en promoción...

Para personas quienes les gusta escuchar música en cualquier parte y con seguridad.

Excelente fidelidad, fácil de instalar y muy elegantes

OVERVIEW: I've been in the market for wireless earbuds for about a year now. I can't stand the hard plastic Apple air pods. Frankly, I don't know how anyone can. The hard shiny plastic is not ergonomic and does nothing to hold them in my ear, and they leak sound both in and out like sieve. Anyway, that's neither here nor there. Enter the Sennheiser CX400BTs. A brand I'm more than familiar with and one that I trust for both build and sound quality and they mostly do not disappoint.

SOUND QUALITY 5/5: Overall these score very high, as they should for being Sennheisers. The soundstage is pretty wide considering these are earbuds. The music doesn't feel like it's on top of you. It has a surprisingly good amount of room to breathe. This makes the imaging very good as well. Imaging is when you can hear the instruments and other acoustic sounds as if they were behind, beside, above, and even in front of you. Think anything by Pink Floyd with all the different sound effects in the background. EQ is hard to rate, really, because the EQ is customizable on the Sennheiser Smart Control app where you can adjust the levels to your taste. This is probably my favorite feature about these earbuds. Having the control and freedom to tailor the sound to how YOU want it is liberating. You're not stuck with whatever the manufacturer thinks sounds good. You can increase bass if you're listening to ambient/electronica or you can boost mids and decrease the highs if you're listening to podcasts. So in all, the sound quality is excellent, but it all depends on how you set it up. Additionally, you can save these custom sound profiles as a preset so if you don't have to fiddle with them every time you switch genres. This feature is simple and intuitive and is extremely useful. While these do not have active noise cancellation, the silicone tips do more than a good enough job isolating the ambient noise around me, allowing me to be immersed in my music. Personally I don't like ACN anyway. I don't like the feeling of pressure they create so this is a non-issue for me.

CONSTRUCTION 5/5: These have the typical high standard of build quality that I expect from Sennheiser. Nothing feels cheap or chincy. All the plastics feel thick and sturdy. The case is small, compact, and is sleek in design. It doesn't have the fabric case that the Momentums have and some people complained about that but you have to remember, they're $100 cheaper, and this decision was purposeful. It seems Sennheiser cut out the more luxurious things in order to bring the price down to a more affordable level, but left alone the important things like sound and build quality. They share the same 7mm drivers as the Momentums, and this is where they really shine. If you're letting the carrying case stop you from buying these, that's your problem.

ERGONOMICS 4/5: These fit in my ear nicely and are lightweight enough to not feel in my ear. They come with three other sizes of silicone tips so they should be able to fit most people's ears with no problem. That being said, they aren't small. They do protrude a bit from the side of my head. They're not exactly inconspicuous in design but personally I don't care what others think. I bought these for the sound quality, fit, and ease of use, of which these excel. I can wear these for long listening sessions without experiencing pain or discomfort in my ear canals.

TOUCH & BLUETOOTH 4/5: The touch commands are easy to remember and simple to use. I won't go over them here. Just know they're not complicated. But if you happen to not like the touch commands, you can customize them to be whatever you want on the app. Yet another feature that Sennheiser includes to make these more versatile and user friendly, especially if you're used to a certain touch command form another brand. Sennheiser flattens out the learning curve with the flexibility of making this customizable. Pairing is easy to do. Simply touch both buds while in pairing mode until it pairs and viola. No need to keep pairing every time you listen to them. Just on the initial setup and then they connect automatically when you insert them in your ear from then on. The only bad thing I can say about hte touch controls is the slight lag time processing the function. There's about a one second delay in pausing/playing, skipping songs. It's a very minor irritant

PHONE CALLS 5/5: I tested out the phone function and I could be heard clearly on these headphones with very minimal, if any lag.

OVERALL: I really like these and I'm really glad Sennheiser finally released a more affordable set of true wireless earbuds that didn't sacrifice sound or build quality. Not everyone can afford the Momentums and these are a solid alternative. The freedom I have by ditching the wire is huge. No more snagging it on things as I walk and ripping them out of my ear. No more stupid lightning adapters to make headphones work with my iphone. These are very convenient in that regard. I love the way they sound and how easy they are to use.

PROS & CONS:

PROS:
- Excellent sound quality
- Excellent build quality
- Intuitive, simple to use Smart Control App allows you to customize sound levels and save presets, and allows you to customize touch commands
- Lightweight
- Doesn't cause ear fatigue/discomfort
- Simple, easy to remember touch commands
- Charging case takes USB-C
- Phone calls have almost no lag
- NO WIRES OR ADAPTERS!!

CONS:
- Battery life is not nearly as long as they claim (20 hours). I get around 5-6 hours. More in the update below
- Be aware that if you place an earbud down on a metal surface, the magnet will read it as you touching the control for volume and it will increase or decrease the volume depending on which one you take out and put down. It’s a little annoying but I understand not too many people work around metal surfaces as much as I do so it’s more of a problem for me, specifically.
- Protrudes from ears a bit and makes them less discreet than other brands
- No ANC, but this is subjective. Not a problem for me but may be a deal breaker for others

UPDATE: I’ve owned these for quite a while now and while most of my above review still hold true, one annoyance I keep running into is battery life of the buds. These don’t last nearly as long as they claim. They claim to last 20 hours on a full charge. I estimate last about a quarter of that. I’ll listen to these a couple hours a day max. I will put them in on the third day after a full charge and the left one will die within a few minutes while the right one still works. I’ll check the charge and it’ll say 20%, meaning the right bud. It’s always the left that dies first and you can’t see the charge for both individual buds. It appears to give you the highest charge between the two, which is useless because if one dies, who cares how charged the other one is. No one wants to listen to music with one bud. I wish there’s had a low battery warning. Just a subtle yet noticeable tone to let you know you need to charge them soon. Unfortunately you just need to keep checking the battery percentage manually from time to time. Sennheiser needs to implement a way to check the charge of both individual buds and they also need to implement a low battery warning so we aren’t in the middle of listening when the left one suddenly cuts out. Because then you can’t listen to music for a couple hours while they charge. For these reasons, I have to give these 4 stars instead of 5. Battery life and ease of use is important with wireless buds. If they lack these things, it makes for an unenjoyable experience.

Let's get the obvious out of the way: these buds are larger than you expect, and heavier, in part due to the 7mm driver (same as the more expensive Momentum line from Sennheiser)... but you won't care about the size or weight, because they just sound so, so incredible.

That 7mm driver does make amazing sound, better than any wireless earbud I've tried, and for around $100 at the time of my purchase, this has better "quality sound / dollar" than anything I've tried.

But there are some odd design decisions. The touch surface for the control on the outside of the big block is hypersensitive (even a quick touch from my hand can trigger a pause, much more sensitive than, say, Airpods Pro). On the good side, you can control volume from these, but it's a bit tricky due to the sensitivity. For all the audio quality, I found I had to set the volume higher with these than with other earbuds on both iPhone and Windows PC Bluetooth (in Windows, go to Sound in the Control Panel (under "Hardware and Sound"), highlight your headphones, click Properties, and select the Enhancements tab. Check "Loudness Equalization" and hit Apply to turn this on, helps a ton). With the plugs in, your do get good isolation from the outside (so "passive" noise reduction), though of course, you now hear every breath and gurgle from inside your body, as you do with any sealed-ear device. Even with a Bluetooth 5.0 connection (they support up to 5.1) on the PC, BT lag is still present; this is really evident watching videos and, to some extent, on video conferences. The buds stick out from your head, and are heavy, so extended wearing became ear-canal sore, but never really painful. The ear tips are silicone, but less flexible than from other vendors: I usually wear a medium in other earbuds, but it feels a touch large for my ears; the small felt too small. I may invest in Comply Foam for the first time.

The buds support SBC, AAC and aptX, which is nice for iOS or Android users. Microphone quality is the usual: it's good enough, but not as good as Airpods Pro, and clearly not the primary focus of the buds. It'll be ok, but expect to have to repeat sometimes, as with almost every wireless earbud out there. Also, I missed the auto-shutoff from so many of the other modern earbuds; these just keep playing when you take them out (luckily, due to the hypersensitive touch panels, I accidentally pause when taking them out most times!).

Also, an odd design choice means that the "power pads" where the buds connect to the terminals in the case is just rear of the earplug; this puts a ridged surface directly touching one of the folds of the ear. If you push the earpiece all the way in, you are putting the one rough surface directly against your ear. Sennheiser could have easily put this on, say, the rear-facing portion of the block and let smooth plastic touch the ear, but, well, they didn't. You'll get used to it, but it's just an unnecessary design choice.

Connection is quick with verbal feedback in the buds. Battery life is as expected, and runs easily the 6 or so hours; the case can give another 12-13. It takes longer than an Airpod Pro to recharge; it's worth charging over a longer break than just the few minutes other products can charge in. The case has a USB-C plug, but the included cable is tiny; throw a normal length one in your cart when you buy this. The case has no wireless charging ability, oh well. The case is larger than expected, a little heavier than an Airpods Pro case, and due to it's rectangular shape and width, a bit pocket un-friendly. The top does have a hinge-helper which holds the top open, something more cases should try.

Sennheiser has an app for iOS and Android, and it really is necessary. It allows a firmware update to 2.13.0 that substantially improved connection speed. You can customize almost all the tap patterns; I added "play pause" to the right ear instead of just on the left. It also lets you store different EQ profiles (just 3 bands, so a bit gross, but better than nothing; there's also a "touch and slide" interface but it's really just a layer on the 3 band). The profiles are stored in the bud, and can be changed live via the app, even if you are listening to another source (so, using the phone to adjust the eq while listening to the computer). The app lets you control the connections as well; like most BT devices, you can't connect to more than 1 source hot at a time (aka no multipoint), and switching is still manual (Apple's Airpods ecosystem is more automatic, and Bose has done a nice job of having 2 sources mounted at once and having easy swapping between them).

These are not sport buds: they don't quite stay in all that well (in my ears) when moving and have 0 water/sweat protection beyond the usual (a bit will probably be fine, but during a heavy workout, these re not fully protected from salty sweat.)

So, other than odd choices in where to put the power connectors, the large size of the main block, the sensitivity of the touch panel, and oddities of the eartips size, the sound quality is amazing, far better than I expected from a Bluetooth connection, esp. for the price. Master and Dynamic has a similar pair that drop in price to around $100, and Yamaha has a nice pair around this price with similar specs, but after trying them all, I'm willing to put up with the odd design choices for that clean Sennheiser sound.

These are simply the best earbuds I've ever used and ever owned. Crisp sound, great battery life, nice features on the app, comfortable...they are absolutely outstanding.

I've used Apple Airpod Pros, Galaxy Buds Pro, Pro Beats by Apple, Jabra 85t Elites, Sony WH-1000xm4s and other mid to high range earbuds and headsets and the sound produced by these topped them all. I realize its down to personal preference but these were my favorites.

They've unfortunately died recently so I'm writing this as a memorial to them. I've used these almost every single day for around 18 months for anywhere from an hour to 10-12 hours a day. I've come to love audiobooks (and have consumed many within a day) thanks to these earbuds. Countless hours of music with Spotify, around 120 books from Audible read since these were purchased...If I were able to count the amount of hours I've used these earbuds since July of 2021, I would say these were worth the investment I spent.

There is 0 exageration in my review, I've been addicted to these earbuds and I carry them with me everywhere. CX 400 BT's, You will be missed.

Poor noise cancellation. Does not connect to two devices at the same time. Sticks out of the ear and does not look aesthetic. Does not have an feature. But sound quality is really good. For the price does not match up to competition

Summary: Better sound quality than most, cheaper than the top-of-the-line active noise cancelling sets, and consistent connectivity.

My background - former recording engineer/musician, so my other set of earphones are quad-driver custom molded in-ears. I'm not expecting that level of quality from a set of $2-300 wireless units, but I don't put up with bad sound quality and I like relatively flat response.

I've previously tried the Jabra 75t's and other, less expensive units, couldn't deal with the sound quality and dropouts. I'm not a fan of hugely stilted EQ (the Jabras in particular had bass that was incredibly overpowering in a bad way).

** The good **

- Sound quality is great for a set of $200 earphones. EQ adjustment was minimal to get them in the 'sweet spot' where I could hear everything. Highs and transients could be a bit smoother, but everything is there and you can pull the things you want up/down vs just having to correct for massive problems. Soundstage is impressive for something this small and (relatively) inexpensive.

- Connectivity is miles better than I've had before. I used to get dropouts riding my bike on other units (3 foot connection distance), and with these I can walk across the room and there's no issue. Time will tell if this holds for other use cases, but so far so good!

- Battery life is solid at 7 hours default, plus more with the case. Longer than I'd ever have them in for in one setting, anyways.

- USB C charger. Love USB C and use it for most of my other devices, so this is handy.

- The Android/iOS app is great and easy to use. Relatively easy setting it up/getting it connected.

** The not-as good **

- Right ear only for solo stuff - doesn't bother me, and they explicitly tell you this in the instructions, but be aware of it if you're a left-ear only type person.

- No ANC - I didn't want active noise cancellation, so up to you if you want it or not. The ANC version the Sennheiser makes is $100 more, so up to you.

- Slightly wonky firmware updates that take 45 minutes. Hopefully won't have to do this often, so not a big deal to me.

Overall, I'm very happy with these - I'd been waiting to see if they'd release a version cheaper than the Momentum Wireless 2's, and this has answered my request! I'll update this review if anything goes haywire down the road, but so far these seem like a keeper.

Sound quality
The sound on these things are phenomenal. Even more so for earbuds at this price range. But hey, its Sennheiser. Also, by using the Sennheiser Smart Control app, you can really make these sound how you want. From high bass, to low treble you can really change a lot. It also has the codecs for many different devices so it will sound great on Apple AND Android devices.

Mic is decent and never had any problems with people understanding me even on windy high speed bike rides. Touch controls are great and responsive. Just try not to hit them when scratching your ears! One thing to not is that the right earbud MUST be out for use while the left one can be put back in the case.

Build Quality:
While the case could feel cheap at times as it just made from plastic, its clear to see that money went into the earbuds. They are very well built and fit great for me. While I don't have the largest ears, I found that the normal size worked the bets. They also come with Small, and large size caps. I also recommend twisting the earbuds inwards for a tighter feel. They have stood in during runs, windy bike rides, and vehicles.

Battery:
Batter is great. I think it gets about 20 hours with he case. You can check battery by pressing the little button on the back. green for high, yellow medium, and red for critical meaning you need to charge very soon. I think you can get about 4 charges with the case but I've had these for about a month now and I've only had to charge these things about 4 or 5 times and I use them for hours! Also. charger uses USB C

Problems:
While I think these earbuds are incredible, I do have some things I think they could add. Given the price range, I think earbuds like these should have some form of a transparency mode. While I think they have the hardware for it, the software does not support it. Honestly, This is the only area I'd say these things were "lacking". Active noise cancelation would be very nice too for the price but sadly, it is not included. It does have passive noise cancelling and honestly, I don't know the difference.

Overall:
Overall? Awesome product. These things sound nothing short of incredible and they fit and are built very well. They allow for great customization of buttons and EQ. About as easy to put on as any other earbuds. If you are looking for high quality earbuds, these are it.

Glad I got this when it was on sale, $99. Now you don't see the deal even on here or Sennheiser website. I think they don't even have it on stock.
Well for the price, it does look big on my smaller ears. It stick out alot but I am used to it. Reason for the dimension, because the drive they put in for sound quality.
For sound, this thing will blow most higher end or even like Jabra 75T out the water. Again go back to the thickness of their driver(sorry I don't know what it call), and you understand why. They invest alot into the sound quality.
While we on sound, I can't be sure how the real performance for the noise cancellation. Once you get the volume high enough, everything all disappeared.
Product overall, once downloading their app, you can customize how to program their touch display for either side. Which, other high end don't do.
Con, to connect the the earpiece to your device, so far I manage to get the right only. I try doing the left earpiece but could never connect. Which I am fine with.
Call quality can depend on your service, I have people on the other side can and could alot of background noise, sort of like white noise. Call is excellent, making calls with voice commands are perfect. So perfect I manage to send text messages on my son phone for a test and every words came out perfect.
I give this a try, but looking at the price now, $199. Is this worth the price now, no. I would upgrade for the Momentum 2. For some reason the sound quality on this model is much much better. You get other feature that isn't on the model(which you can research yourself).
Conclusion, best if you got on the $99 deal. Perfect for everyday need. Oh forgot, on some videos from browser, there is a small, very small lag between voice and video. Isn't bad still. I think the update fix it a bit so that made it not too noticeable.
Buy it, but another $50 or so, you get yourself the Momentum 2 and you can seal the deal with sound quality and many other features that isn't on this model.

I have been a fan of true wireless buds for a long time, but the sound quality is always in some way sacrificed. Mostly it's the restrictions of the bud. It can only do so much being that small.

I have tried Monster, Samsung, SoundPeats, Meze, Marshall, Anker, and even Klipsch.
Among some of the cheaper brands too.

So firstly, I have to say I have small ears. It makes it hard for me to family review some of them because they won't fit in my ears comfortably... A poor fit may skew the proper sound I would be getting if they fit...

The sound quality is 5 star. Remembering, they are true wireless buds in the moderate price range.
I am certainly not an audiophile in the truest sense but I do appreciate and expect the best of what it can do and Sennheiser hasn't disappointed.
The sound is crisp, I hear all the hinted instruments in the background that you should in those certain tracks. The bass is decent, not too overpowering.
There is an app that you can adjust the EQ to your liking.
Now for you small-eared people; you're going to need to get silicon replacement tips that have the little moulded ear clip thingy to get them to stay in. They come with the standard plug-type. For some of us, this just doesn't work.
You just know I'll be standing over the kitchen sink when one decides to pop out.
(They are rated for water, but you know...)
If you can find the right tip for your ear, they'll be great.
(Those Samsung Live Buds have the weirdest, most uncomfortable fit for my ears ever!)
The price is right, the product presentation is nice, touch sensors are very sensitive and the battery lasts quite well, which is always relative to how loud you have them up. But for moderate use, quite good; 5-6 hours. Charging time is reasonable.
I have not yet connected them to my phone so I cannot speak to the call answer, etc part of that, but I assume it works well. I bought them for music only.

I am pleased, and would recommend them.

Ive had these earbuds for a year to replace my airpods that finally broke after 3 years. To compare the two, the audio is much better and clearer than the airpods and they sit comfortably in my ears since you can change out the ear piece but the connectivity of the Bluetooth is really hit or miss at times. Compared to the airpods ive had so many issues with the bluetooth connection on these Sennheiser's from one earbud not playing audio even though it said it connected, constant lagging of audio and cutting out from signal interference to the point where I just want to take them off and destroy them, and of course them just not playing audio at all until i reset it multiple times. In conclusion, I would not buy these again but they did serve me well for the past year whenever they actually worked, will probably replace these with something else since it really annoys me whenever my music keeps cutting out.

The review for:
"Sennheiser CX400BT True Wireless Earbuds".
Ships from and sold by Amazon.ca.

Overall: 5/5
Sound quality: 6/5
Bass quality: 3/5
Functional feature: 4/5
Bluetooth connection: 3/5
Fit in ear: 4/5
Battery life: 3/5
Passive noise cancellation: 4/5
Active noise cancellation: n/a
Transparent hearing: n/a
Budget friendly: 5/5

Mono/Independent mode: n/a
Static noise: barely noticeable
Waterproof: --
Delivery: 6 days
Purchased time: Jan 2021

Scale
5=best      6=superior
4=good
3=decent
2=poor
1=better than nothing
0=better without it
n/a=none
sp=depends on individuals or situations
--=haven't test, measure, nor paying attention

Overall: 4/5
Very good pair, GREAT sound signature and quality. A budget deal for great music earbuds, just like the "Momentum TWS 2". The misleading(my case) playtime description is also just like the "Momentum TWS 2" as well. The lacking of ANC and transparent mode might massively affect outdoor users.

Pros: GREAT sound signature&quality(TWS), customizable touch control, budget friendly to music listeners using TWS.
Cons: 4hrs battery, no IPX rating, no transparent mode.

Sound quality: 6/5
Superior sound quality compare to almost all other true wireless earbuds. Very pleased sound signature that stands out from all other true wireless earbuds. It is not the best sound quality EARPHONES, but I doubt there is any TRUE WIRELESS EARBUDS with a better sound quality than this one.(Only heard the momentum 1&2 TWS might have better sound quality.)

Bass quality: 3/5
There is decent bass, just not for bass-head.

Functional feature: 4/5
Have all necessary features for indoor music listening. Customizable control feature could be very enjoyable for using experience.

Bluetooth connection: 3/5
Decent, not strong compare to others. Only used for music listening, not tested for lagging. Short pauses occasionally happens while playing l, last 0.3-1s each time.

Fit in ear: 4/5
Comfort in general. Decent secure fit. The size of the buds itself could be a little big, no issue for long time wearing, not recommended for activities with head movements. A little slippery when holding with fingers on the earbuds, much better than the "Momentum TWS 2" on hand due to its square shape.

Battery life: 3/5
Decent but disappointed. Unlike its advertised 7hrs for playtime (50% volume), the playtime I tested barely passed 4hrs, could gain another 40mins when just listen to audiobooks. It could be a lemon, or 3, make it 5 if add the "Momentum TWS 2" experience to the list. The white colour I tried got me another 15mins compare to the 2 black colour I've tried.
PS: The battery of the case could fully charge the both buds for at least twice for extension.

Passive noise cancellation: 4/5
Good seal. When wearing both ears, may hard to identify the contents of speaking.

Budget friendly: 5/5
Considering to the similar sound quality with Momentum 2 TWS, the current price is very budget friendly for music listeners who like to have a pair of quality true wireless earbuds.
Purchased price: CDN$ 129.95

Review posted: Feb 2021

Sound quality is excelente! They are a little bulky so they tend to fall off my ears. Only the right earbud can be use independently.

The sound quality of these headphones are great and the batteries last a long time however, they stopped working with calls out of nowhere and it cannot be fixed. I contacted customer service and they didn't have a solution to fix it. Also, sometimes when I'm out and about, one headphone will just disconnect and I will have to reset the headphones a bunch of times to get it to work again. Overall, I'm glad with my purchase because they are great for music but I just wish these issues could be fixed.

Habe einige In Ears getestet (im Preissegment bis 150 Euro).
Diese Sennheiser haben den für mich bis dato besten Klang. Der Sound ist warm und schön voll. Höhen und Bässe sind nicht betont, so wie es vielfach bei anderen Headsets gemacht wird. Heißt: Wer (einen neutralen) Klang priorisiert, dem sind diese Sennheiser sehr zu empfehlen - vor allem für einen Preis von rund 100 Euro (Stand Februar 2021).
Die Touch-Bedienung funktioniert sehr gut. Im Gegensatz zu anderen InEars kann man damit auch einfach die Lautstärke regeln. Bei vielen anderen InEars kann man die Lautstärke meist nur eine Stufe rauf oder runter regeln, hier geht es bei längerem Druck auf eines der InEars stufenlos.
Es gibt kein Grundrauschen, was bei Podcasts oder ruhigen Musikpassagen stören könnte.
Die Videolatenz (am Android Telefon) ist zu vernachlässigen (für mich kaum wahrnehmbar).

Es gibt dennoch Nachteile:
Mich störte, dass man nicht beide InEars unabhängig voneinander nutzen kann (der linke funktioniert nicht ohne dass man den rechten verbindet).
Der Sitz ist generell gut und angenehm, längere Telefonate funktionierten aber "mit meinen Ohren" nicht ohne dass die InEars durch die Bewegung rausgerutscht sind.
Es gibt kein(e Angabe zu einem) IPX-Rating (Spritzwasserschutz o.ä.).

Und "Neutral":
Die Spieldauer (sprich Akkuleistung) lag bei ca. 66% Lautstärke auf einem Huawei Android Telefon ein klein wenig mehr als 5 Stunden.
Die InEars schalten sich automatisch nach einer Weile ohne Tonübertragung ab. Durch längeres Drücken kann man sie wieder anschalten (ohne dass man sie wieder ins Case legen muss).
Das passive Noise-Cancelling ist gut (es gibt kein aktives Noise-Cancelling und auch keinen Transparenzmodus)
Das Case selbst fand ich entgegen einiger anderer Reviews kompakt und relativ robust.
Die Touch-Bedienung funktioniert nicht (wie zB bei den Airpods Pro) durch Stoff wie zB eine (sehr dünne) Mütze.

[Sep 2022 update:] Dropping from 5 stars to 2, after using these for a couple of years. While the sound quality is still very good, I have found these issues:
a) newer version of Android app no longer works with these earbuds. Though Sennheiser makes pretty good sounding products, such a major manufacturer should not be abandoning their products after just 2 yrs. Given their poor software and support, I will not be buying any more Sennheiser products in the future.
b) occasional BT connectivity issues. When connecting to my MacBook Pro, earbuds say "connected" and MBP bluetooth does list CX400BT earbuds as connected, but sound continues to come thru laptop speakers. Shrug. Worked fine literally yesterday with the same laptop. It usually does work fine, but it's mighty frustrating when it doesn't.

[orig review:] Best sounding earbuds I've used. Wide soundstage, great detail, solid, clean bass. Smooth, satisfying mids. The controls are well designed and pairing was easy. Touch earbud touchpad for 3 seconds and it says "pairing" so you know it's pairing. No putting it back into the case and taking them out again multiple times to get them to pair again like with some earbuds. Comfortable enough, though it could be better. The squarish shape isn't the best fitting for ears. Would've liked to see the case have 4 LEDs for power level instead of a single LED with multiple colors. With such a tiny LED, the color is not that easy to make out. Even cheap $30 BT earbuds have multiple LEDs so I'm not sure why Sennheiser couldn't have them here too. The Sennheiser Smart Control app is easy to use and works well. It allows you to tweak the EQ, see the battery level of the earbuds and update firmware of the earbuds.

The overall package (the case, the earbuds exterior, the box it came in) is very basic. If you're looking for something fancy and nice looking to impress your friends, these will not. The earbuds themselves are not sexy looking or stylish or flush fitting in your ear, they are on the bigger side and stick out of your ears a bit. If you're vain and care about that, then these are probably not for you. No ANC, obviously, or ambient sound pass through so if those features are requirements, you should look elsewhere. No sweat/water resistance either, so not so good for working out or using in the rain.

But if you don't want yet another muddled, overly bass-boosted, small soundstage TWS, if really excellent sound quality is way up there in importance and you're looking for a convenient, highly portable way to really enjoy your music listening experience for a not-cheap-but-not-super-expensive-either price, these fit the bill very nicely.

I take back what I said about them being terrible quality. They're alright for earbuds, but I wouldn't go as far as saying that they're worth $90 USD, let alone its standard price of $200 USD. I've been working with electronics & audio equipment since I was a kid and I'm quite picky when it comes to proper audio quality. In order for them to at least function to my likings, I had to reset my audio equalizer with the earbuds in focus. I use Breakaway as my preferred audio equalizer for PC. The buffer rate is insane since they're wireless but it gets the job done until my preferred earbuds get sent back from a warranty claim. I'm still debating upon keeping them as a backup pair due to the audio quality they come without the EQ modification. If your looking for supreme quality at a cheaper price, you're better off heading over to 1more. I bought a pair of quad driver earbuds (4 miniature speakers dedicated to a different fidelity types per earbud) last year, and of course since they were wired and had a mic on the right, the right earbud went faulty and I'm getting a replacement soon. But overall, for spending $110 USD on that pair, it's worth every penny. In my personal opinion, if you are a frequent audio listener, then I'd suggest trying out a pair of those. The quality is unrivaled and once you get used to them, you cant go back to a standard audio experience with other earbuds, or headphones.

Good side:
Very good sound quality
They fit tightly in the ear and doesn't come off easily once in
The case adds a good amount of battery to your earbuds 2-3 charges or so

Bad side:
The case is very slippery and it needs to be handled with care that's annoying It fell once from about 20cm and the hinge is already loose (still ok tho but it prob. be dead if from higher).
It might be related to how my ear is, but after 4 hours or so it starts to get uncomfortable. I have others earpices that doesn't do that soo it's a minus for me.
Battery life or the earbuds could be better at this price.

Overall good earbuds honestly.

These are comfortable, but clunky and a bit ugly.

Most important the sound is great.

Here are my pros and cons...

Pros:
- the sound quality is excellent - 7mm driver sounds good out of the box without EQ
- reasonably comfortable, I expect to be able to survive long listening sessions
- I was able to get a great seal with included tips
- app is average
- equalizer included
- case is small and light
- case indicates battery level, but only high-medium-low
- touch controls are very easy to use - no little button to search for

Cons:
- clunky earpieces - stick out beyond the edge of your ear
- took about 45 minutes to upgrade the software (huh???!!!)
- more detailed battery status visible when you open the case would be better
- can't tell if they are charging when in the case
- no ANC, but wouldn't expect at this price level
- passive NC not impressive
- no comments on dust or moisture resistance

Overall a bargain at $99!

These earbuds impressed me at first but I grew increasingly disappointed with them over time. The sound was great, the app was pretty good and they do fit pretty snugly in the ear, it’s not impossible to have them fall out but seem to remain in the ear longer than many other brands I’ve tried.
The first disappointment came when I immediately discovered the batteries didn’t quite last as long as promised in the literature. It was significantly under performing in that area, and the case unconnected didn’t give much of a recharge. You end up keeping the case connected at all times to the charger despite its claimed ability to deliver a second charge just from the unconnected case.
The final disappointment came when, after 18 months, the right earbud (the one that does the Bluetooth connecting) completely died on me, out of the blue one day. I tried multiple soft resets and hard resets but that had no effect. The right earbud is non-responsive, will not connected to any device and doesn’t appear to be charging at all.
Since the right earbud is the one that establishes the BT connection, with that one dead, despite the left bud appearing to charge fine, neither earbud will deliver sound, thus making the earbuds useless and an expensive mistake.
Great sound and comfort…if only they were reliable and actually lasted longer than 18 months.
Verdict: Keep looking.