Overview: These Flashing LED Valve Caps can be used on any kinds of Cars, Motorcycles & Bicycles. Just simply taking off the old valve & replace it on your car. The Valve Caps will be lighted & flashed when your car is moving. When you stop driving, the built-in sensors will stop the lights in half minute automatically. It's Safe, Awesome & Eyes-catching indeed! Specification: Super Bright Blue LED Tire Light LED Valve Caps x 2 Pieces Equipped with light sensor Valve stem lights up when vehicle is in motion & works during nighttime Powered by 3 x button cells (included) Net weight: 12g Dimensions: 41 16mm Easy installation In retail packaging Weight Approx:12g Size Approx:4.1 x 1.6 x 1.3