This light is USB-Rechargeable. You can charge this light from your computer or any device with a USB port.It has a runtime of 4.5+ hours on the highest setting, making it a top of the line light. This light can be installed easily. The strap is elastic enough to fit all kinds of bikes and can be mounted on any part of the bike. The strap can be easily loosen and fasten, and no tools are required. Our light has three modes and versatile usage. The mountain road bike headlight features a single button to select three different light modes:high-low-flash. And you can also adjust the focus freely by zooming the light body. The light sis perfect for hunting, camping, fishing, running, walking dog and indoor/outdoor activities. This light is water resistant. Use this durable and well-constructed light no matter what the weather conditions are.Being waterproof it can withstand rainy days. foggy nights and stormy nights as well. Color: Black Material: Aluminum alloy LED: XML T6 LED Waterproof level: IP65 Material: Aluminum Alloy 3 Modes: High-Low-Strobe Rear Light: Mode: 4 modes. Brightness: 15 lumens Mounting Placement: bicycle seat post USB rechargeable bicycle taillight and auto cut off when fully charged. Super waterproof,make you riding freely regardless of rain. Package includes: 1 x Bicycle Front Light 1 x Bicycle Rear Light USB Cables Features: 1. Zoomable 2. Battery case removal 3. Can be rotated 360 degrees "all Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem Or You Are Not Satisfied With The Product contact Us. we Will Give You The Best Solution."