Happy Hours - Waterproof 20 Led Bike Wheel Light String Safety Flash / Led Strip Lamp for Night Riding Cycling Bicycle Spoke Fun Tire Light Working with 3 AA Batteries Power battery: 3 AAA bateries, rechargeable lithium battery 950MAh Shell feature: waterproof, perfect for bicycler to ride at night 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