1) The most important and significant minus is the microphone. The interlocutor hears everything except me. Talking is only possible by holding the right earpiece to your mouth (because it only has a microphone) in a quiet room. It's almost impossible to do it on the street. 2) Jamming, stuttering, lagging behind the video. Rare, but very unpleasant. 3) The left earpiece is generally connected from the second or third time. Yes, and the sound in it is much weaker, without the right naunika you will not listen. Size 3. Maybe they are bulky for my small female ears, but it seems that they are about to fall out or get caught on something. To immediately conveniently insert into your ears, you need experience) 3) Well, such an indirect minus - there is no cover anywhere on the case, the plastic is easily scratched and dirty.