【USB Rechargeable】: Durable USB rechargeable battery-Built-in 650mAh lithium battery makes these LED bike lights super bright in the dark. 3 hours charging, 6 hours running time, no constant battery replacement. Absolutely the best USB bike lights for cycling enthusiasts! 【Four Light Modes】: More switching modes allow you to better adapt to the surroundings, Both the white front bike light and the red rear bike light support 4 light modes: full brightness/half brightness/fast flash/slow flash modes. By simply clicking the button, you can switch modes as you like. 【Easy Installation】: Stretchy watch strap is very easy to attach securely to your bike. This rechargeable bike light set comes with 4 flexible silicone mounting straps that provide easy installation and attachment, suitable for all types of bikes. It also won't fall off or come loose even on rough terrain. You can attach or detach it without effort or tools when needed. 【Waterproof and Durable】: The bike lights are waterproof, which is rated at IPX4 - protected from light rain and splash water, lighting up your way in all weather conditions! At the same time, the rechargeable bike lights are made of durable plastic and aluminum alloy, which are extremely durable, have excellent compressive strength and are very suitable for rough terrain. 【Hard Shell】Adopting high-quality aluminum alloy shell, it has excellent impact resistance, heat dissipation and corrosion resistance. You don't have to worry about it suddenly raining or snowing. It is specially designed for cyclists who ride in night environment.