Material:Plastic Fit Type:Universal Fit Vehicle Service Type:Passenger Car, Truck, Bicycle, Motorbike Number of Pieces:20 Shape:Wheel Item Weight:4.6 ounces Package Dimensions:6.46 x 4.25 x 1.18 inches Batteries:3 Lithium Metal batteries required. Position:Inside Bulb Type:LED 1.Please kindly note there is a piece of paper in the battery case that needs to be removed before use. Sometimes it still not work when you remove the paper, then you need to put them on the valve stem and ride, they will light up. About this item [ Wide Application]Wheel lights are suitable for various types of bicycles, automobiles, motorcycles, mountain bikes, road bikes, children's bicycles, etc, which with American valve valves; The wheel lights are super cool and Increases nighttime and bad weather visibility in all directions [ Alert Function] The LED flash tire light has the function of indicates a warning light and decoration night driving, can enhance visibility at night and in bad weather to ensure safety; enhance visibility at night and in bad weather to ensure safety [ Waterproof Durable]These tire valves were totally made of premium plastic material, qualified, no toxic chemicals, no bad smell; No need to worry about on rainy or snowy days; Quality construction built to last, so you can use it for a long time; But please do not immerse these cool bicycle tire lights in the water [ Easy To Instal]No Tools can be easily installed or removed without any tools; Simply screw them onto the tire valve, This product is a single-sensing vibration type valve lamp, the wheel lights will turn on only when the wheel turns, and it turns very beautiful See more product details [ Wide Application]Wheel lights are suitable for various types of bicycles, automobiles, motorcycles, mountain bikes, road bikes, children's bicycles, etc, which with American valve valves; The wheel lights are super cool and Increases nighttime and bad weather visibility in all directions [ Alert Function] The LED flash tire light has the function of indicates a warning light and decoration night driving, can enhance visibility at night and in bad weather to ensure safety; enhance visibility at night and in bad weather to ensure safety [ Waterproof Durable]These tire valves were totally made of premium plastic material, qualified, no toxic chemicals, no bad smell; No need to worry about on rainy or snowy days; Quality construction built to last, so you can use it for a long time; But please do not immerse these cool bicycle tire lights in the water [ Easy To Instal]No Tools can be easily installed or removed without any tools; Simply screw them onto the tire valve, This product is a single-sensing vibration type valve lamp, the wheel lights will turn on only when the wheel turns, and it turns very beautiful