Whosee Bicycle Wheel Flash Light, 4-Pack Bike Motorbicycle Tire Valve Cap Neon LED Flash Lamp The valve caps will be lighted and flashed when your car is moving ,when you stop driving ,the built-in sensors will stop the lights automatically. Enhances safety by increasing visibility at night and during bad weather conditions. Fit for any kinds of Cars Motorcycles Bicycles. Easy to install,just simply taking off the old valve and replace it on your car. Durable, High Impact, Rust Resistant.