When paired with my smart phone, the microphone transmits exceptionally well and the earphones are clear and fit comfortably. Considering myself an audiophile, when listening to music on the same smartphone, the sound is muddled, the highs do not stand out, the bass is ok but the midrange seems to overpower the other frequencies. The set is comfortable, the fit is light and the battery lasts at least two hours, I have not tested it beyond.