The SPH10H-FM is a Bluetooth headset & intercom designed for half helmets By simply attaching the SPH10H-FM to your half helmet, you can call handsfree on your Bluetooth mobile phone and listen to stereo music by Bluetooth wirelessly, and have intercom communications in full duplex with other users Features include Bluetooth 3.0 Simple earpad design for quick installation to half helmets Bluetooth intercom up to 700 meters (760 yards) Four-way conference intercom Multipoint for 2 mobile phones Built-in FM radio tuner with station scan/save function Bluetooth stereo headset for Bluetooth audio devices such as MP3 players Water resistant for use in inclement weather Crystal clear and natural sound quality Up to 7 hours talk time, 8 days stand-by time Two-year warranty