Feature: 100% brand new and high quality Material:Plastic Length:15*3.8*1.5cm/5.9*1.5*0.6" The product is consist of 16 pcs LEDs、Both side bright It can flash 32 different patterns、and the patterns will be changed every 3 seconds Patterns is clear and completely when speed up to 20kms/hr Equipped with light sensor and movement sensor、flash only at night and action It will not work and save power when not riding Battery:Operated by 3x AAA(NOT included)、could be max to 12hrs when it workPackage Content: 1PC Spoke Lights 4PC Screws