USB Rechargeable:Durable USB Rechargeable Battery-Built--in 650mAh lithium battery makes these LED bike lights super bright in the dark. 3-hour charge, 6-hour runtime, No constant battery changes. Absolutely the best USB bike lights for cycling enthusiasts!Four Light Modes: More switching modes allow you to better adapt to the surrounding environment,Both the white front bike light and red rear bike light support 4 light modes: full brightness/half brightness/fast strobe/slow strobe modes. By simply clicking the button, you can switch modes as you wish.Easy to Installation:Stretchy watch band strap design is very easy to affix securely to your bike. This rechargeable bicycle light set comes with 4 flexible silicone mounting straps that provide an easy instalment and stronghold, Fits all kinds of bikes. Neither does it fall nor get loose even on rough terrains.You can fasten or loosen it with no effort or tools when needed.Waterproof & Durable:The bicycle lights are water resistant, which rated to IPX4 - protected from small rain and Splash water, lighting up your road in all conditions of weather! At the same time, the rechargeable bicycle lights are made of durable plastic and aluminum alloy, which are extremely durable, has excellent compressive strength, and is very suitable for rough terrain.Versatile ApplicationsWith its ultra-bright light and easy-to-install design, our bike light is not only a riding companion, but also serves as an essential emergency flashlight.When you're biking, running, hiking, scooting, walking the dog, out at night or facing a power outage, these rechargeable bike lights are your ideal choice.