AVRCP was designed to provide a standard interface to remotely control the music playback in the source device. This includes pausing, stopping, and starting playback and volume control as well as other types of remote control operations. Using sound isolation earphones are a good choice because they make it possible to hear the music in clear detail at a lower volume. I have had them for over 6 months now, and i will share with you my impressions. She states "Stereo music played through the Voyager 855 sounded middling to poor. I heard some bass, though it distorted easily and was more boom than actual punch.