Features1Multifunctional 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. 2Multiple 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. 3USB 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. 4Lightweight 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. 5Waterproof 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.SpecificationItem Type: Bike Tail LightMaterial: ABS, Electronic ComponentsWeight: Approx. 63g / 2.2ozBattery Type: Lithium Battery (Built In)Battery Capacity: 250mahWaterproof Rating: IP66Package List1 x Tail Light1 x Charging Cable6 x Ties2 x Rubber Sticker3 x Accessories1 x Instruction Manual