ITEM NAME:BT10 Soft Motorcycle Interphone Riding Bluetooth With Microphone Helmet Headset Features: The bluetooth headset is designed by the designer according to the inner structure of the motorcycle helmet CSR4.1+EDR Bluetooth technology is used, which has strong signal transmission and low power consumption Support all Bluetooth devices, support automatic answer function, call no longer need to manually answer the phone Support up and down, volume increase and decrease, play pause, automatic callback and other functions Built-in 500mA large capacity battery, long stand-by and working time. Specification Material: ABS Color: Black Package box size(L x W x H): About 23.5 x 10 x 4.7cm Bluetooth version: V4.1+EDR Frequency range :2.4026GHz-2.480GHz Transmission distance: 10M(transmission distance varies depending on environmental factors and mobile Bluetooth devices) MIC distance: ≠¤1 m Battery: 3.7 V / 500 mA rechargeable battery(built in) Charging time: 4-5 hours Standby time: about 180 hours Duration: about 32 hours Bluetooth name: BT10 Answer mode: automatic/manual Input mode: Bluetooth Horn specifications: diameter 30MM 32 Euro 0.5 W Charging voltage: USB5V Response frequency: 180-2000khz Distortion: ï ¼Å“1% Noise ratio: ï ¼Å¾80 db Package included: 1pc x Helmet Headset 1pc x Charging Cable 1pc x User Manual Notice: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow 0.5-2cm differences due to manual measurement..CSR4.1+EDR Bluetooth technology is used, which has strong signal transmission and low power consumption. Support all Bluetooth devices, support automatic answer function, call no longer need to manually answer the phone.