100% brand new and high quality USB Rechargeable:The bicycle taillight is built on a large capacity rechargeable lithium battery. After fully charged, it can work continuously for 5-32 hours.(It depends on the light mode) 5 Light Mode Options: The bike tail light has 5 different light modes: Full Bright, Fast Blink- and Slow Blink-, Marquee A, Marquee B, Breathing Light. Flashing modes make you visible even on the busiest roads or dark routes. < br/> Simple Installation- The silicone taillight strap fits most handlebars and seatposts. And it is very widely used, including stroller, scooter, wheelchair, skateboard,backpack, dog collar, etc. Excellent Safety: The waterproof bike rear light can be used in rainy days. This bicycle rear light is equipped with COM LEDs that provide super bright red light, make your ride safer. Buy with Confidence: If you have any questions, don't hesitate to contact us, and we will try to serve for you until you are satisfied.