DescriptionThese LED Bike Wheel Lights are easy to install. Screws onto the stem of your car, or motorcycle in seconds. They fit most bicycles, motorcycles and cars. Those LED lights will flash when you're driving at night for safety and visibility.Feature- Color: As shown - Material: metal and plastic - Size: 65.5 x 30 x 22.5mm - Flash mode: turn on /off or change light wroking mode( Steady or flash) by pressing the button on the battery box - Waterproof design to ensure light work normally on rainy day - 2.2 meters led ight string, Mixed Colors - Installation: Fix the battery container on the vavle stem, and enlace the light string on the spokes tightly - Great compatibility: whether the of your bike is American or French style, whether your bike is mountain bike, road bike or ordinary bike, this stem lights can be perfectly matched.