Features1Easy installation, it can be fixed on cycle spoke. 2Consists of 32pcs colorful LEDs. 3Flash 30 kinds of flower patterns which will be changed every few seconds. 4Pattern is clear and completely when speed up to 20 km / hour. Equipped with light sensor and movement sensor, flash only at night and moving, it will not work and save power when not running. 5Operated by 3 AAA batteries, can work about 30 hours. 6Consists of 32pcs colorful LEDs. Easy installation, it can be fixed on cycle spoke. 7Equipped with light sensor and movement sensor, flash only at night and moving, it will not work and save power when not running. 8Pattern is clear and completely when speed up to 20 km / hour.SpecificationColorful Rainbow 32 LED Wheel Signal Lights for Bikes bicyclesFeatures:Easy installation, it can be fixed on cycle spoke.Consists of 32pcs colorful LEDs.Flash 30 kinds of flower patterns which will be changed every few seconds.Pattern is clear and completely when speed up to 20 km / hour.Equipped with light sensor and movement sensor, flash only at night and moving, it will not work and save power when not running.Operated by 3 AAA batteries, can work about 30 hours.Specifications:Size: 16.5 * 3.8 * 1.5cm/6.5 * 1.5 *0.7inPackage Weight: 93g / 3.3ozPackage Includes:1 * LED Signal LightPackage List1 * LED Signal Light