Features: Consists of 14pcs colorful LEDs. Light with 45 gorgeous and cool patterns shining by turns. Pattern is clear and complete when speed is up to 14km/h. Showing riding time and wheel revolution. Easily installed on your hub. Turn off automatically. Powered by three AAA batteries (not included). Water resistant design， can be used in rain. Note: The wheel light can be used in rain but can not be soaked in the water. Specifications: Quantity of LED: 14 Material: Plastic Limit of wheel diameter: 20in and above Requirement of speed: 14km/h and above Product size: 23 * 5.5 * 2.2cm / 9.1 * 2.2 * 0.9in (max.) Product weight: 60g / 2.1oz Package size: 26 * 10 * 2.5cm / 10.2 * 3.9 * 1in Package weight: 125g / 4.4oz Package List: 1 * 14 LED Wheel Light 1 * Sensor 1 * User Manual(English)