Item Type: Motorcycle Bluetooth Headset Material: ABS Transmission Distance: Approx. 10-15m / 32.8-49.2ft (Transmission Distance Varies Depending On Environmental Factors And Cell Phone Bluetooth Devices) MIC Distance: 1m / 3.3ft Built In Polymer Lithium Battery: 500mAh Playback Time: 15-20h Standby Time: 240h Charging Time3h Package List 1 x Motorcycle Bluetooth Headset 4 x Fastening Tape 2 x Screw 2 x Nut 1 x Instruction Manual 1 x Windmuff 1 x Fixed Bracket 1 x USB Cable 1PROFESSIONAL DESIGN: Motorcycle helmet BT headset is carefully designed by the designer according to the internal structure of motorcycle helmet full helmet half helmet. 2SIMPLE OPERATION: Motorcycle bluetooth headset supports up and down songs, volume up and down, play and pause, automatic callback and other functions, simple operation, easy to use. 3HANDS FREE CALLING: Helmet BT headset supports hands free calling, which really frees your hands and ensures driving safety. Support answer, reject answer, hanging up and redial phone function. 4LOW BATTERY WARNING: Low battery warning lets you know that the battery is low and needs to be recharged. In power saving mode, it will automatically turn off after 5 minutes if there is no working device paired with it. 5500MAH HIGH CAPACITY BATTERY: Helmet Bluetooth headphone has a built in high capacity 500MAh battery. Suitable for CE, for RoHS, for FCC and other European and American environmental protection, safety testing. 6STABLE SIGNAL TRANSMISSION: Helmet bluetooth headset has super strong signal transmission, ultra low power consumption, expenses all bluetooth devices, providing more stable and fluent connection.