TOOGOO(R) 2 x Colorful Flash LED Lights Bike Bicycle Car Wheel Tire Valve Stem Cap Safety Car or bicycle wire lights, LED lights, night riding warning, direct plug wire on the bike, tire rotation, then it will light up, serve as both decoration and warning When your wheels start to move, they automatically flash light up creating a solid disk of light that appears to hover above your wheels. When you stop they will switch off to save battery power Make your car looks beautiful Bring more enjoyment to your drive Increases nighttime and bad weather visibility for safety