Suitable for most hats, this complete combination provides easy illumination; This LED lamp has 3 adjustable brightness settings: high, medium, and low, allowing you to select the appropriate brightness level for use in the dark USB charging: the flashlight features a standard USB port, compatible with any standard USB power source; Can be charged using a car charger, computer, wall outlet, or portable power bank; Indicator light turns red during charging and green when fully charged, making it simple and convenient to use Easy to install and replace: if you have an LED knit beanie hat, simply remove the damaged headlight and replace it with this LED headlight; For hats without built-in lights, you can adjust the hat fabric to fit the light unit; Includes leather straps that can be sewn onto your hat for secure installation; This kit is ideal for hands-free lighting in various work environments Simple to operate and clean: press the button on the LED light to cycle through brightness levels; To clean, gently remove the lens cap from the headlight, then wash the beanie as needed Suitable for many occasions: this rechargeable LED light is ideal for walking, camping, hunting, snow shoveling, fishing, cycling, running, hiking, barbecuing, car maintenance, and more; Convenient hands-free design suitable for a wide range of activities Material: plastic Color: black Package Contents: 4 x Rechargeable LED lights Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement error allowed within +/- 1-3 cm.