Superior audio quality?? bigger sound?? remote control functionality and seamless 1-click pairing.</br>Wireless Bluetooth Music Receiver for audio docks made for iPhone 4/4S (30-pin) including?? Bose SoundDock*?? Logitech?? JBL?? Phillips?? Sony?? & other 30-pin iPod/iPhone speaker docks.</br>No batteries?? no maintenance. Powered by the dock you connect it to. Wireless range 33 feet?? 10+ meters (free space).</br>Uses the Bluetooth A2DP protocol to easily stream your audio. The dockBoss air is not compatible with systems that require digital audio signals.</br>*Compatible with most docking stations. Not Compatible with Series I Bose S