Features: 1. Wide field of view, width of field of view, lumen LED light, bright enough to be seen in fog\/rainy days or even dark night. Provide you with super brightness, but not dazzling. 2. USB can be charged. Bicycle tail light USB charging is fast when fully charged, and it can work continuously for about 5 hours under constant brightness. Save time to change the battery every week. Never waste money on batteries again . 3. The waterproof function can withstand rainy and humid climates, and the waterproof is specially designed for outdoor bicycles. The best safety equipment for outdoor riding can be used as a Christmas gift for friends and relatives 4. Install bicycle light back hooks on belts, running gear, reflective vests, backpacks, dog collars, chest straps or any position on clothing. It can be installed on bicycles, helmets, scooters, strollers, wheelchairs, or anywhere you can imagine. Strengthen the safety factor of night travel. 5. If you have any questions, please contact us. We will do our best to solve Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Description: Color:Black includes: 1XControl Turn Signal