1Waterproof MIC case, can be used freely in water. The shell of the movement is pure ABS material for high reliability. 2Carefully designed according to the internal structure of a motorcycle helmet. 3Adopts Bluetooth 4.1 + EDR technology, ultra-strong signal transmission, ultra-low power consumption. 4Without any obstacles, the effective receiving range is up to about 15m/49.21ft. 5Built-in MIC, you can answer the phone while listening to the song. Can be used for mobile phone hands-free system, easily make or receive calls, clear voice quality. 6Support all Bluetooth devices, free phone, voice dialing, music GPS voice prompts. 7Built-in large-capacity lithium battery, multiple circuit protection, and can be repeatedly charged through the USB port, to ensure standby and working time. 8Support volume up and down, play pause, up and down song and other functions.Condition: 100% Brand New Item Type: Helmet Headset Material: ABS Color: Black Bluetooth Version: V4.1+EDR Frequency Range: 2.402GHz-2.480GHZ Transmission Distance: Approx. 10m/32.81ft(straight line distance) Microphone Distance: 1 Meter/3.3ft Li-ion Battery: 3.7V/ 250mABuilt-in)Charging Time: 2.5 hours Standby Time: About 60 hours Continuous Working Time: About 16 hours Bluetooth Name: BT151 x Helmet Bluetooth Headset1 x Manual1 x USB Harness2 x Install Stickers