A Bluetooth v2.1 Class 1 Stereo Headset with long -range Bluetooth Intercom, designed specifically for motorcycles Bluetooth intercom up to 900 meters (980 yards) Multi-Pair Bluetooth intercom for a 4-person network Bluetooth stereo headset for Bluetooth A2DP audio devices such as MP3 players Bluetooth music playback control by AVRCP: play, pause, track forward and track back Easy operation by versatile Jog Dial Outstanding sound level with integrated audio booster Hands-free operation with Bluetooth mobile phones Bluetooth headset or stereo headset for Bluetooth GPS navigation Stereo music by 3.5mm audio cable Water resistant for use in inclement weather Crystal clear and natural sound quality Up to 12 hours talk time, 10 days stand-by time Can be used while charging on road trips (Charge-on-the Fly) Individual volume control for each audio source Earbud capability option sold separately (see 134-640 and 134-641)