Easy installation and water resistance. It consist of 36 high visibility RGB LED lights， which can make you safe riding. The speed of 15k/m can be better to display patterns completely. It can flash 30 different patterns， and the patterns will be changed every 5 seconds. It is applicable to 24 inches wheel. Specifications: Material: ABS & PC Light Color: Colorful Light Number: 36 LED lights Mode: 32 Modes Waterproof: IP55 Battery: 3 * AAA Batteries(not included) Working Hour: 40 Hours Item Size: 44.5 * 2.5cm / 17.52 * 0.98in Item Weight: 90g / 3.17oz Package Size: 47.5 * 6 * 3cm / 18.70 * 2.36 * 1.18in Package Weight: 149g / 5.25oz