Color Red + Blue. Fixing Type Seat Mount Item dimensions L x W x H 7 x 2 x 2 centimeters Position Rear auto part International Ingress Protection Rating IPX4 About this item Get Safety: The rear bike light emits a wide-angle beam eye-catching which can be seen from the blocks, don’t worry about being knocked down by others. Whether running, walking with your dog, biking, skateboarding or hiking, these safety lights will keep you safe. USB rechargeable: stop wasting your money and don’t never buy batteries. The bike taillight charges from your computer or any device with a USB port. Only takes 2 hours to fully charge. Super bright with 4 modes - slow flash / alternate fast flash / all lights flash quickly / full brightness, the bike backlight has four lighting modes that you can easily tip over. IPX4 Water Resistant - Highly sealed construction - strong and waterproof. These taillights are all-weather water resistant, and extremely durable. Easy Installation: With a convenient release