[USB Rechargeable and Waterproof] The LED bicycle wheel light has a built-in rechargeable battery, which can last for 12 hours after being fully charged. And it can be easily charged by any device with a USB port. [IPX 5 Waterproof] The IP55 waterproof design means that you are 100% covered in all types of severe weather. With this bright LED wheel light, your bicycle wheel is always visible at night, making your riding safer. [Multiple modes] One key to easily switch colors and modes. Click to switch the mode between constant light, slow flashing, and fast flashing; double click to switch the color between red/blue/light blue/green/yellow/purple/white and color. Long press to turn on/off. It is very suitable for safe riding at night, keeping your wheels cool in the dark. [Universal Bicycle Wheel Lights] Perfect safety warning lights and decorative lights, suitable for almost all bicycles, including road bicycles, off-road vehicles, BMX, hybrid bicycles, and even children's bicycles (wheel diameter: 19~36mm). Product description Control button (Press and hold for 3 seconds to turn on the device.) Bicycle wheel lamp size Installation diameter of bicycle wheel hub: 19mm-36mm Product size: Diameter 9.5cm Equipment width: 1.7cm Hub hole diameter: 3.65cm Power of bicycle wheel light USB charging: USB charging, eliminating the trouble of replacing the battery. Charging time: about 4 hours. Use time: 8-12 hours (lighting duration depends on the selected flash mode) When the light only flashes red and green, the battery is low and needs to be charged. Bicycle wheel lamp installation steps The first step: select the appropriate gasket in the internal test of the bicycle light. Step 2: Put the bicycle light on the wheel hub. Step 3: Tighten the buckle to fix the hub lamp. Step 4: Complete the installation. Multiple flashing modes: The red/blue/light blue/green/yellow/purple/white lights are always on, flashing fast and flashing slowly. Multi-color lights flash quickly, slowly, and alternately. Bicycle wheel light mode switch Press the power button once to change the flash mode. Press the power button twice in succession to change the color of the light. Press and hold the power button for 3 seconds to turn on/off the light.