USB charging light - built-in 220 mAh rechargeable lithium battery, which can be charged from any USB port. The waterproof grade is IPX4- to prevent splashing of water at any angle. Super bright, with 4 modes - full brightness/half brightness/fast flashing/slow flashing, it has four lighting modes that you can easily switch between. Driving safety: The taillights emit a striking wide-angle beam, which can be seen a few blocks away without worrying about being knocked down by others. Whether you are running, walking your dog, cycling, skateboarding, or hiking, these safety lights will keep you safe. Easy to install - With a convenient one click disassembly button, you only need to slide the light to turn on and off the bracket without disassembling the entire installation bracket. The silicone strap design for the taillights has four openings, which can tightly fit most sizes of handlebars and seat pillars.