Usage Tips: Suitable for most hats, complete combination for easy illumination; This LED lamp has 3 adjustable brightness levels: high, medium, and low light modes, allowing you to select the most appropriate brightness for use in the dark. USB charging: The flashlight features a standard USB charging port and can be charged via any standard USB port; Compatible with car charger, computer, wall outlet, and portable power bank; The indicator light turns red during charging and green when fully charged, making it easy 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 according to the light's shape; Equipped with leather straps, which can be sewn onto your hat for secure installation; This set is ideal for hands-free lighting in various work environments. Simple to operate and clean: Press the button in the middle of the LED light to adjust the desired brightness level; For cleaning, gently press and remove the headlight cap to detach the light unit, allowing you to wash the beanie hat easily. Suitable for many occasions: This rechargeable LED flashing light is ideal for walking, camping, hunting, shoveling snow, fishing, cycling, running, hiking, barbecuing, car maintenance, and more; The hands-free design makes it convenient for use in a wide range of situations. Color: Black Package Contents: 4 x Rechargeable LED lights Note: Only the items listed above are included. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.