Login tres good, very good app. Buttons unhook, +/- and piloting of music (stop / plecture, following and previous ranges): Very well. The sound ... it is the "HD" port (not bad and the microphone is also pretty good) andthe has the stereo for music, unlike other bluetooth headsets. . But it remains a sound quality bluetooth only (with lossy compression on the mp3 ... which is already as mp3 ....) so quality enough "average." DESIRABLE FIRST IMPROVEMENT: occasionally connect to the headset with jack for a sound quality improved in (listening to music ... have the quality of the original medium that can be good to mp3 pro or some non compresses formats). This lack of jack lose 1 star. BUT A BIG BLACK POINT THAT MAKES ME PASS THE 4 TO 3 STARS: there is nothing to hang it around the neck ... And it is heavy behind the neck (it's all relative of course ..) therefore tends to fall the back which is heavier than the 2 headphones reunited .. Also for the same reason you do not feel well because the vibrator as it falls a bit backwards, it is no longer in contact with skin .. .on rate Call !! Finally, always for the same reason it is dropped regularly, putting or removing a jacket etc .. without even sometimes just moving nothing "normally". Conclusion: Good but can do better. It nevertheless remains the best "bluetooth turn of blow" that I found. It must imperatively to predict the "tinkering" by adding an elastic thread connecting the two atria son to avoid losing it ... like that just happened to me.
