The SPH10H-FM is a Bluetooth Headset and Intercom designed for half helmets By attaching the SPH10H-FM to your half helmet, you can call hands-free on your Bluetooth mobile phone and listen to stereo music by Bluetooth wirelessly and have intercom conversations in full duplex with other users Offers exceptional sound quality for both incoming and outgoing sound in its class Easy-to-access and intuitive button operations make the SPH10H-FM a perfect companion for motorcycle riders Bluetooth Specification v3.0 Working distance (intercom) of up to 980 yards in open terrain 4-way conference intercom Multipoint for Mobile Phone+GPS Voice prompts Bluetooth stereo headset for Bluetooth audio devices such as MP3 players Bluetooth music playback control by AVRCP (Audio Video Remote Control Profile): play, pause, track forward and track back Crystal clear and natural sound quality Simple ear pad design for quick installation to half helmets Compatible with shorty helmets in the market Easy headset controls by versatile Jog Dial Bluetooth hands free for Bluetooth mobile phones Water resistant for use in inclement weather 10 hours talk time.