Suitable for most hats, this complete combination offers easy illumination. This LED lamp features 3 adjustable brightness settings: bright, medium, and dim light modes, allowing you to select the optimal brightness for dark environments. USB charging: the flashlights come with a standard USB, enabling charging through any standard USB port. You can use a car charger, computer, socket, or portable power bank for charging. The indicator will turn red while charging and green when fully charged, making it easy and convenient to use. Easy to install and replace: if you have a knit beanie hat, simply remove the broken headlight lamp and replace it with our LED headlamp. If your hats do not have LED lights, you can cut the hats according to the shape of the light. Equipped with leather straps, you can sew the straps on your hat for light installation. This combination is perfect for anywhere you need work lighting while keeping your hands free. Simple to apply and clean: press the button in the middle of the LED light to adjust it to the desired brightness. Before cleaning, gently press the headlight lamp cap to remove the lamp, then you can easily wash the beanie hat. Suitable for various occasions: this rechargeable LED light is ideal for different activities, such as walking, camping, hunting, shoveling snow, fishing, cycling, running, hiking, barbecuing, car maintenance, and more. The hands-free flashlight can be utilized in a wide range of settings. Material: plastic Color: black Package Contents: 4 * rechargeable LED lights Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to vary slightly from the real thing. The measurement allowed error is +/- 1-3cm.