Material: ABS plasticSize:13.5 x 5.2 x 2.4CMLED Number: 14Description:Waterproof ，shuts off automatically.Can installed on the front or back wheel.14 blue LED light， 40 design patterns and five word patterns， patterns change every three seconds.Display sequence: Message， Patterns， Time of Riding， Number of Rounds， PatternsCar lights increase night-time and bad weather visibility for safety.Requires 3 x AAA batteries (Battery Not Included).The LED lights will keep blinking for two minutes after wheel has stopped.Package Included:1 x Wheel Light (battery not included)Kindly Reminder:This product is long，so that it fits on bike with a wheel diameter of 20" or greater.