Features： 1、Multifunctional Safety Light: This bicycle tail light is not only easy to install on various bicycles, but also can be used as a helmet light, backpack light, warning light, etc. One light for multiple uses, enhance your safety. 2、Multiple Light Modes: The tail light offers 6 light mode options, including constant light, breathing flash, slow flash, endurance flash, rhythm flash and fast flash. You can switch different modes according to your needs and environment to create a stunning lighting effect, increase attention and ensure the visibility of your ride. 3、USB Charging Convenience: The taillight has a built in USB charging port, no batteries are required, and it can be charged by connecting to a power source via USB cable. When fully charged, the indicator light changes from red to green, providing you with long hours of use, convenience and environmental protection and energy saving. 4、Lightweight And Durable Design: The bicycle tail light is made of lightweight and durable ABS material, with strong impact resistance and durability, able to withstand the bumps and shocks of daily riding, maintaining stable brightness and providing you with lasting lighting effects. 5、Waterproof Design: The taillight is made of IP66 grade waterproof material, with waterproof performance. Whether it is raining or muddy road conditions, it can be used safely, so you do not need to worry about the light being damaged due to water intrusion, adding to your riding safety. Specification： Item Type: Bike Tail Light Material: ABS, Electronic Components Weight: Approx. 63g / 2.2oz Battery Type: Lithium Battery (Built In) Battery Capacity: 250mah Waterproof Rating: IP66 Package List： 1 x Tail Light 1 x Charging Cable 6 x Ties 2 x Rubber Sticker 3 x Accessories 1 x Instruction Manual