USB Rechargeable Bike Spoke Lights String Cycling Wheel Lights Bicycle Lightweight Accessory (White) Shell Color: Black; Shell Feature: Waterproof. Main size: 35mm diameter,75mm length; Light cable length: 2200mm. Flashing mode: 2 mode (Constant and flashing light); Power: 1x USB 18650. Charging time: 3-4 hours; Working time: 35hours (constant light);70 hours (Flashing light). Product Features: Super bright, lower energy consumption, Could be installed on spoke easily.