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 is equipped with a standard USB port and can be charged via any USB power 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 this LED unit. For hats without built-in lights, you can cut a small opening to fit the light according to its shape. Includes leather straps that can be sewn onto your hat for secure installation. This setup provides hands-free lighting suitable for various work environments. Simple to operate and clean: Press the button on the center of the LED light to adjust the desired brightness level. To clean, gently press and remove the lamp cap, then wash the beanie hat as needed. Suitable for many occasions: This rechargeable LED light is ideal for walking, camping, hunting, shoveling snow, fishing, cycling, running, hiking, barbecuing, car maintenance, and more. Its versatile design allows for hands-free lighting across a wide range of activities. Material: Plastic Color: Black Package Contents: 4 x Rechargeable LED lights Note: Light and display differences may cause slight variations between the color shown in the image and the actual product. Measurement error allowed is +/- 1-3 cm.