FEATURES: 1.Automatic change color Wheel Light, one light can automatic change to different color. 2.Uniquely design, make your car, bike more stylish 3.Auto turn off either the enough brightness or stopping wheels running 4. Powered by 3 AG10 button cell batteries (included) 5.Light color: colorful Built-in light sensor. Only light up and flash in darkness and wheels running. DESCRIPTION: 1.This LED Bike Wheel Light fits most bicycles, motorcycles and cars. 2.LED Bike Wheel Light features motion sensors, LEDs and replaceable batteries 3.LED lights will turn on when the vehicle is moving and off when the vehicle comes to a stop. 4.Enhances safety by increasing visibility at night and during bad weather conditions. 5.Small and exquisite appearance, it is convenient to carry. Package include 2x Car/Bike wheel LED lights 4 x Button batteries Pay attention: Do not use in Freeway!! Before using:Please unscrew the cap and take of the battery stopper between the battery and Led Spring first and then you can make them work!