Colorful Rainbow 32 LED Wheel Signal Lights for Bikes Bicycles
Operated by 3 AAA batteries, can work about 30 hours.Specifications:Size: 16.5 * 3 * 1.5cm/6.5 * 1.4 *0.7inPacage Weight: 93g / 3.3ozPackage Includes:1 * LED Signal LightThe video linkhttp://www.youtube.com/watch?v=PDhIy1DZRQo&feature;=youtu.be