Increases nighttime and bad weather visibility for safety, Bringing more enjoyment to your drive., Installs on standard tire air stem valves of cars, motocycles or bicycles., Suitable for Schrader valve and Dunlop valve,cars, motorcycles, electric cars, and bicycles. not suit for Presta valve unless put adapter., Led Flash Tire Wheel Valve Cap Light can enhance visibility at night and in bad weather to ensure safety. When your wheel starts to move, it automatically flashes and forms an aperture of light which make your car/motorcycle/bicycle look beautiful.,