Product Description:Material: ABS, 14 pcs LED lamp beadsProduct Dimensions(inches): 4.33" * 2.76" * 0.59"Weight: 1.13 ounceBattery: 1 x AAA battery (Not included)Graphics: 30 patterns changes every 4 secondsWorking Time: 8-10 hoursSwitch: Auto Open/CloseFeaturesThe light equipped with light sensor and movement sensor, flash only at night and action. light glows when bike moves, turns off after stop moving for 30 seconds.Fun pattern effects, controlled by your riding speed. The faster you ride, the more complete and beautiful the patterns are.Bike wheel lights led waterproof designed, Comes with excellent leakproofness, capable to prevent water from penetrating inside the battery, so you don't need to worry about riding in the rainy day, So especially useful if you fancy a late night bike ride.Awesome Birthday Gifts & Popular Christmas Presents for Kids, Children, Adults, Boys, Girls and yourself.Important: When the batteries are put into the bike light, the light shows up for couple seconds and then it is out, the light will not flash at bright environment, only flash at night and action.Products from NIUNIU's store