Xiaomi Commuter Helmet

Features:- Impact Resistance - Eye-catching - Lightweight and Comfortable - Suitable for Family - Stylish Specifications:- Circumference (CM):52-56 (S) ,55-58(M) - LED lights:6 - Ventation holes:13 - Bluetooth:BLE4.1 + BT4.2 - Speakers:2 0.5W - Charging port:Magnetic USB - Battery capacity:3.7V 450mAh - Battery Durability:Approx.10 hours at Light /... more3-6 hours at music and light - Standby Durability:Max.180 days - Charging time:Approx.3 hours - EL parameter:DC5V / 0.5A.