USB Rechargeable Light: USB rechargeable front and back lights, built-in 2000mAh rechargeable lithium battery for Headlight, and built-in 330mAh rechargeable lithium battery for Taillight.Super Bright with 4 Modes: The Headlight and Taillight feature a one-touch switch with four different lighting modes depending on your preference. Include full brightness, half brightness, fast flashing, and slow flashing.Easy Install/Quick Release: The Headlight is equipped with a mounting bracket that can be easily fixed to the handlebar. The silicone mount strap for Headlight and Taillight is designed with four openings that tightly fit around most size seat posts. Both Headlight and Taillight can be easily loosened and fasten, and no tools are required.Multi-Purpose: This bicycle lights will bring you visibility lights for extra safety and protection in bad weather. No more than a bike light also can be used as an Emergency flashlight, torch, helmet headlight for cycling, camping, walking, or other nighttime work.