It is a wonderful tool for the people who love riding bikes.
Features: Easy installation and water resistance. With soft pad, it is anti-shock. It consist of 128 high visibility RGB LED lights. With the sensor, the power will be out automatically when you are not riding. The speed of 15k/m can be better to display patterns completely. The picture will be changed every 3 seconds. The rechargeable battery can work about 15 hours. You can download pictures from the internet and design your pictures with the USB cable. It is applicable to 26 inches wheel.