About this item IMPROVE YOUR SAFETY: LED Flash Car Tire Wheel Valve Cap Lights can increase nighttime and bad weather visibility in all directions to make you and your loved ones safer, and bring more enjoyment to your drive. WATERPROOF AND RECHARGEABLE: These tire valves were made of premium plastic material. No need to worry about cycling on rainy or snowy days. With a USB cable, they can be rechargeable, allowing for long-term use. Please do not immerse these bicycle tire lights in water! APPLICATION: Suitable for US valves of cars, motorcycles, electric bikes, and bicycles. When your wheel starts to move, it automatically flashes and forms an aperture of light, enhancing the beauty of your vehicle. EASY TO INSTALL: No tools are needed; installation or removal takes just a few seconds. It installs on standard tire air stem valves of cars, motorcycles, or bicycles. Fully charge for 20 minutes before use. Simply remove the rubber ring, turn on the switch, and install it on the valve stem by rotating and tightening. It will emit a fascinating aura with the vibration of the tires. PACKAGE INCLUDE: 4 Colorful Super Cool bright LED bike Wheel Tire Valve Lights. Compact Package Dimensions allows for quick and easy storage, and it's the perfect gift for individuals of all ages on special occasions. Use it in bike/motorcycle/car parades, social rides, and more. Package Dimensions: 1.18 x 0.79 x 0.79 inches.