<b>KINDLY TIPS</b></br>: 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. </br> </br> Product Description: Brand Name: JIANGLAI</br> Material: ABS, 14 pcs LED lamp beads</br> Product Dimensions(inches): 4.33" * 2.76" * 0.59"</br> Weight: 1.13 ounce</br> Graphics: 30 patterns change every 4 seconds</br> Working Time: 8-10 hours</br> Switch: Auto Open/Close</br> Battery: 1 x AAA battery (Not included) </br> </br> The 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. </br> 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. </br> </br> Fun pattern effects, controlled by your riding speed. The faster you ride, the completer and more beautiful the patterns are. </br> Awesome Birthday Gifts & Popular Presents for Kids, Children, Adults, Boys, Girls and yourself.