The SMH10 is a Bluetooth v2.1+EDR Class 1 Stereo Headset with long-range Bluetooth Intercom designed specifically for motorcycles. With the SMH10| you can call hands-free on your Bluetooth mobile phone| listen to stereo music or voice instructions of GPS navigations by Bluetooth wirelessly| and have intercom conversations in full duplex with a passenger or other motorcycle riders. Thanks to the latest Bluetooth v2.1+EDR and the advanced digital processing technology| the SMH10 offers the best sound quality for both incoming and outgoing sound in its class. Also| the easy-to-access and intuitive button operations make the SMH10 a perfect companion for motorcycles. The SMH10 Dual Pack kit contains two complete sets of the SMH10 in a single box. Bluetooth Specification v2.1+EDR| Class1 Bluetooth Intercom up to 900 meters (980 yards) in open terrain Multi-Pair Bluetooth intercom for 4 persons 3-Way Conference Intercom 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 (Patent Pending) Sufficient sound level with integrated audio booster Bluetooth hands-free for Bluetooth mobile phones Bluetooth headset or stereo headset for Bluetooth GPS navigations 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 Individual volume control for each audio source Firmware Upgradeable Peace of Mind - thanks to the 2-year warranty