The SPH10H-FM is a Bluetooth Headset and Intercom designed for Half Helmets. By simply 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. The SPH10H-FM offers exceptional sound quality for both incoming and outgoing sound in its class. Also, the easy-to-access and intuitive button operations make the SPH10H-FM a perfect companion for motorcycle riders.