Sena SMH-10 Bluetooth Headset Dual Pack The SMH10 is a Bluetooth v3.0+EDR Class 1 Stereo Headset with long-range Bluetooth Intercom designed specifically for motorcycles. With the SMH10 on your helmet, 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 helmet communication system 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. System 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) Clamp unit 223.8 mm x 85.5 mm x 30.6mm (8.8 in x 3.4 in x 1.2 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 promts 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 Please Note Some of the above features require updating the firmware to the latest v4.1. The firmware is a free download from Sena Technologies .