The wheel lights are compact design and lightweight high intensity light to increase visibility at night for safety. The lights make impressive effects which vary with wheel speed -- all the way up to full motion circle. The light is perfect for car motorcycle and bike at night. - Flash Wheel Light for car/motorcycle/bike - Automatically on when the wheel runs/off when the wheel stop running - Compact design and lightweight High intensity light increases visibility at night for safety - Makes impressive effects which vary with wheel speed -- all the way up to full motion circle - 3*AG10 batteries included (replaceable)