Style:Headband Communication:ctors:USB Use:motorcycle helmet Function:MicroWaterproof,Noise Canng,Bluetooth talking range:1200m version:CSR BC5 3.0 profile:Advanced A2DP & EDR feature:DSP noise-canceling Speaker power:0.25W Bulti-in battery:550mA Talking time:8hours Standby:150hours Charging time:2.5 hours Adapter:100-240V 50 60Hz, Output: 5V 500mA