Good headphones by JVC. The sound is good, a little flat, with good treble, bass working with an equalizer. Taking call key / microphone is in the right atrium. Early inconvenient but we made it. The insulation of the external noise is not bad, but not enough for users of public transport. You can hear the sound and music, but includes both the noise from the metro. An odd key, the switch A to B on the cord, which serves no one except you go from a stereo to mono pourri.Je see no circumstance in which we might prefer the second position. Very nice design and nice part-ear.