The SPH10 is a Bluetooth Stereo Headset with long-range Bluetooth intercom designed specifically for outdoor sports activities Allows you to call hands-free on your Bluetooth mobile phone, listen to stereo music or voice instructions of GPS navigations by Bluetooth wireless, and have intercom conversations in full duplex with your companions Offers the best sound quality for both incoming and outgoing sound in its class Easy-to-access and intuitive button operations makes it a perfect companion for outdoor activities Stable and secure fit for active condition Working distance (intercom) of up to 980 yards in open terrain Four-way conference intercom Conference call with intercom participant Multipoint for mobile phone+GPS Voice prompts Bluetooth stereo headset for Bluetooth 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 Sufficient sound level with integrated audio booster Bluetooth handsfree for Bluetooth mobile phones Bluetooth headset or stereo headset for Bluetooth GPS navigations Durable, sweat and water resistant Crystal clear and natural sound quality Up to 10 hours talk time, 7 days stand-by time Individual volume control for each audio source Firmware upgradeable Peace of mind - thanks to the two-year warranty