The bike wheel light is special designed for bike decoration and safety cycling. Perfect safety warning and decoration lights for almost all bikes including Road Bikes, Dirt Bikes, BMX, Hybrid Bikes, and even for children bikes. Feature - Color: As shown. - Material: PC+Aluminum alloy. - Size: 9.1x1x1cm - Battery type: 3xAG13. - Work time: 10h. - AUTOMATIC LIGHT: The bike lights will turn on automatically when the vehicle is moving and off automatically when the vehicle comes to a stop. - RIDING SAFETY: The LED lights are designed to increase riding safety by increasing visibility at night and during bad weather conditions. - EASY TO INSTALL: It is easy to install and remove, which is compatible with various bikes. - GREAT ACCESSORY: They are specially designed for the vocational rider or casual cyclist. - Easy and convenient to use. - Move-controlled LED sensor, automatically ON / OFF. - Make your bike cool and eye-catching. Warm Tip: Dear buyer, Due to lighting effect, monitor& 39;s brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.