Suitable for most hats, this complete combination provides easy illumination. This LED lamp features 3 adjustable brightness settings: high, medium, and low, allowing you to select the most appropriate brightness level for use in the dark. USB charging: The flashlight has a standard USB port and can be charged using any standard USB source, such as a car charger, computer, wall outlet, or portable power bank. The 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 the new LED headlight. For hats without built-in lights, you can cut a small opening to fit the light unit. Equipped with leather tabs, you can sew them onto your hat and securely attach the light. This setup is ideal for hands-free lighting in various work environments. Simple to operate and clean: Press the button on the center of the LED light to adjust the brightness level. To clean, gently press and remove the headlight cap, then wash the beanie hat 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. Its hands-free design makes it versatile for numerous activities. Material: Plastic Color: Black Package Contents: 4 x Rechargeable LED lights Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.