USB Rechargeable BatterySave your money on batteries again and again. The front light has a built-in 800MAH rechargeable battery, the rear one 540MAH, they only take 1 hour to be fully charged. There is a hidden USB charging port on the side of the device, it can be connected to a computer and other USB port devices to charge quickly, which facilitates charging and prevents unnecessary battery replacement forever. Easy Install RemoveClips on easily and stays on securely. The USB-rechargeable front bike light is no tools required, light head is easy to attach and remove, whether walking your dog, cycling, skate boarding, hiking, motorcycle, these ultra-bright safety lights will keep you safe. Durable IPX5 waterproofCombined with advanced IPX5 waterproof and dustproof technology, it is suitable for all weather conditions. USB interface is covered with a waterproof and dustproof silicone, so that the bicycle lights can be better charged, prolonging its life effectively.