Surprisingly enough these Sony headphones offer listening in any remarkable point in terms of its poor ability to deliver a sound, function and Walkman in my mobile radio Xperia s the sound is demonstrated round, warm, no unpleasant clipping, bass and treble are well represented; for this kind of listener's fragile appearance (robustness is an interrogation to which I can not answer) for calls with my smartphone Xperia S reception is very good and shows no flaw or telephones or headphones, it is of course compatible with other smartphone in the Xperia range, the overall impression is positive, I can only recommend the to this day I am very satisfied.