A very thin hole in the sound guide, if it gets dirty, the sound becomes very quiet or completely disappears. It can not be called a disadvantage, just information, perhaps it will be useful to someone. Got pros: Passive soundproofing. You don't hear the surroundings, people don't hear what's playing there. Holds a charge very well. Ease of wearing. Comfortable ear pads No problem with NFC connection. Vibrate when you call, handy when you forget that they are connected The sound is ok except for. Got cons: I remembered those wonderful times when I listened to a cassette player on a dead battery. Those ears are stuttering! They are stupid! Not much on most tracks, I would forgive a couple of stutters. But for example, on a particular track, they shamelessly blunt so that physical pain sets in. I have other bluetooth headphones, full-size, ordinary china with ali, they have everything in order with this track on the same phone. For those who are interested, try it for yourself. Anacondaz Trains, search for music, FB, anywhere. Tried in another player, reduced the bitrate, do not care. Such is the dark magic. Everything is actually crossed out by this. Perhaps the problem is specifically this instance or a bundle with my particular phone.
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