Suitable for most hats, this complete combination provides easy illumination. The LED lamp features 3 adjustable brightness settings: high, medium, and low, allowing you to select the most appropriate level for use in the dark. USB charging: the flashlight is equipped with a standard USB port, compatible with any standard 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 easy 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, cut a small opening to fit the light shape. Equipped with leather straps, you can sew the straps onto your hat and securely attach the light. This combination is ideal for various work environments where hands-free lighting is needed. Simple to operate and clean: press the button on the center of the LED light to adjust brightness levels. To clean, gently remove the lamp cap, take out the light unit, and wash the beanie as usual. Suitable for multiple ocns: this rechargeable LED flashing light is ideal for walking, camping, hunting, snow shoveling, fishing, cycling, running, hiking, barbecues, car maintenance, and more. Versatile and easy to use in a wide range of scenarios. 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.