Happy Hours - USB Rechargeable Waterproof Bike Led Light/Bicycle Motorbicycle Lamp Flash Tyre Wheel Light Strip Night Riding Cycling Safety Fun Spoke String Power battery: USB power, rechargeable lithium battery 950MAh Shell feature: waterproof Power is recommended to install on the flower drum, which leaves no cycling Center influence and will not affect the safety & speed Super light and energy saving High brightness, the new circuit board, low energy consumption, can bind to the frame, the spokes