Power: USB charging. Flash about 24 hours. Function: Waterproof, Shockproof, Safety. Only side & rear warning light about 1 month.
ROCKBROS Cycling Light Helmet Bike Ultralight Helmet Electric Bicycle Helmet USB
ROCKBROS Cycling Light Helmet withTaillight Ultralight Helmet Bicycle Helmet USB
ROCKBROS Cycling Light Helmet 3 Modes Electric USB Helmet Bike Ultralight Helmet
ROCKBROS Electric USB Helmet Bike Ultralight Helmet Cycling Light Helmet 3 Modes
ROCKBROS Electric Bike Ultralight Helmet USB Helmet Cycling Light Helmet 3 Modes
