Features Waterproof Bicycle Rear Tail Lights LED. Ultra-bright to keep you safe. Easy To install for Cycling Safety Flashlight. Such as the seat post and anyother place you can install. USB rechargeable rear bicycle light - stop wasting your money and never buy batteries again. Description Material:Plastic. Size:8.5*2.5cm. Color: As pictures show. Power:USB charging. Lighting time:3h. Package included: 1 * Bike rear light. 1 * USB cable. 2 * Rubber ring.