Rechargeable USB design: each LED light has a built-in rechargeable lithium battery. The lights are powered from anywhere and can be charged via any USB port (includes 4 USB cables)High visibility, four light modes: our LED lights set of 4 contains high efficiency 2 white lights and 2 red lights, you can switch between different light modes as needed, which ensure excellent visibilityWaterproof and versatile: the lamps are compact and waterproof, so they can light up in any weather. Freely mountable for a wide range of travel essentials. Also for backpacks, strollers, safety vests or wherever you want, with the freedom to use it in any wayEasy to install: with the help of the elastic silicone strap, you can install and remove the LED light in seconds without toolsPerfect compatibility: it is also ideal for night hiking, running, camping, pram light and many other outdoor activities. It is safe and fun as it can be switched to different light settings at the touch of a button, a safe partner for at night