The Bell Sena SMH10 is built specifically for the Bell Mag-9 and Qualifier DLX Sena helmet and is a Bluetooth v3.0+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 v3.0+EDR and the advanced digital processing technology, the Sena SMH10 bluetooth 3.0 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. Features Audio Booster Individual Volume Control Versatile Jog Dial Use while charging Upgradable firmware General Talk time: 12 hours Standby time: 10 days Working Distance (Intercom): up to 900 meters (980 yards) in open terrain 4-way conference intercom Dimensions Headset: 84.1 mm x 56.5 mm x 38.6 mm (3.3 in x 2.2 in x 1.5 in) Headset weight: 60g (2.11 oz) Clamp unit: 84g (2.96 oz) Bluetooth Profiles: Headset Profile, Hand-Free Profile (HFP), Advanced Audio Distribution Profile (A2DP), Audio Video Remote Control Profile (AVRCP) Bluetooth v3.0+EDR Audio Built-in SBC Codec Voice prompts Conference phone call with intercom participant Noise cancellation Wind noise reduction Wide volume control Sample rate: 48kHz (DAC) Auxiliary audio-in connection via 3.5mm jack Battery Charging time: 2.5 hours Type: Lithium polymer battery