PURPOSE: The valve cap can protect the tire valve from dirt and dust and extend the service life of the tire. It can also be used to replace the broken original valve cap and keep the wheels working well FLUORESCENT EFFECT: The fluorescent effect on dark roads adds a shiny and luxurious look to your car. Make your night cycling cooler and greater.Absorb the light source when there is light, and emit light when it is dark! DURABLE: This Tire valve lamp is made of premium material, quality construction built to last, also has passed the waterproof test, suitable for all kinds of weathers, even can be used on rainy days. But please do not put it in the water too long. EASY INSTALLATION: Easy installation without tools. Simply screw it onto the tire valve stem. Its easy to install or remove when you want to check air pressure WIDELY USED: The universal size fits most cars, buses, SUV, trucks, motorcycles, and bicycles, etc., keeping the tires of vehicles at the proper inflating level Specifications: Material: Light aluminum alloy Power Supply: Button battery (Package includes), battery life: 1-3 months Energy-efficient Design: Light on when the vehicle is moving, off when the vehicle stops moving Installation Site: Car/bike/motorcycle wheel valve Suitable Models: Universal tire valve lights, suitable for cars, bikes, motorcycles, electric cars, bicycles Applicable Valve: Suitable for American valve and English valve. French valve unavailable. Package Included: 2/4/8 x Tire Valve Lights Attention Please: Please note that there is an insulating paper inside the battery case, which needs to be removed before use. Sometimes the light may not turn on after removing the insulating paper. In this case, you can shake the light by hand to make the sensor touch the battery. If it still doesn't work, try a new battery. If the tire lamp can't be turned off after being turned on, you can loosen the connection to prevent the sensor from contacting the battery, so that the light will not light up, and then tighten it to light it. If the tire light does not go off automatically after being stationary for a period of time, you can slightly loosen the connection so that the sensor does not touch the battery and the light will go off, and it can continue to light up after tightening. Tire wheel light may be damaged during transportation. If you receive a non-working lamp, please contact me and we will compensate.