Suitable for most hats, this complete combination provides easy illumination. The LED lamp offers 3 adjustable brightness levels: high, medium, and low, allowing you to select the most appropriate setting for use in the dark. USB charging: the flashlight features a standard USB port, compatible with any USB power source such as car chargers, computers, wall outlets, and portable power banks. The indicator light turns red during charging and green when fully charged, making it convenient and user-friendly. 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 light. For hats without built-in lights, cut a small opening to fit the light and secure it using the included leather straps by sewing them onto the hat. This setup is ideal for hands-free lighting in various work environments. Simple to operate and clean: press the button on the LED light to adjust brightness. To clean, gently remove the lamp cap, take out the light unit, and wash the beanie as usual. Suitable for multiple activities: this rechargeable LED light is perfect for walking, camping, hunting, snow shoveling, fishing, cycling, running, hiking, barbecuing, car maintenance, and more. Hands-free design makes it practical for a wide range of uses. 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 may vary by +/- 1-3 cm.