Features: Universal Type: The LED wheel light is suitable for cars, motorcycles, electric vehicles, bicycles with American or British valves. French valve not available. PVC Material: The clear tire valve stem caps are made of PVC, which is light-transmitting, strong and durable, and can also be used in rainy or snowy days. But please dont submerge them in water! Car Decor: When your wheel starts to move, it automatically flashes and forming a cool aperture of light which make your car or motorcycle look beautiful. Easy to Operate: No drilling or any modification required. Please review the precautions before installation. And it can also improve visibility at night and in bad weather, as well as prevent leakage, water, dust, and sand to ensure driving safety. How it Works: You need to feel a slight vibration to light up. If the body has been kept in a stable state, it will not light up. Each light will last for 15-20 seconds. Specifications: Material: PVC Color: Clear Light color: Blue, red Size: (Approx)(LxW) 3.7x1.7cm/1.46x0.67inch Power by: 3 x button batteries (included) Application: Fit forAmerican or British valves, not fit for French valves Package Included: 4pcs x Valve stem lights Note: 1. Due to the light and screen difference, the items color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement. 3. The wheels lights are made of three AG10 batteries (included). Please install the positive and negative poles correctly. 4. Be sure to put the battery inside the black insulation holster inside, do not expose it, otherwise the short circuit of the battery and the metal of the lamp case will cause the battery to discharge heat, and there will be no electricity for a few minutes. 5. Be careful when twisting the lamp head. Make sure that the metal strip in the notch on the side of the lamp head is in good contact with the metal base (if the metal is too close to the inside, you can pull it out manually, but be sure to light!) 6. If the wheel lights do not light under normal conditions, you can adjust the length of the spring to ensure full contact with the battery (not too hard, it is easy to cause the spring to fall off), or it will not be bright. Then Step 3 again.