1. Suitable for most hats. The complete combination facilitates lighting in... This LED light has 3 adjustable brightness levels, namely high, medium, and low light modes. It can be adjusted to the most suitable brightness for use in the dark. 2. USB charging: The flashlight is equipped with a standard USB interface and can be charged through any standard USB port. You can use a car charger, computer, socket, and power bank for charging. The indicator light will turn red when charging and turn green when fully charged, making it easy and convenient to use. 3. Easy to install and replace: If you have an LED knitted beanie, simply remove the damaged headlamp and replace it with this LED headlamp. If your hat doesn't have an LED light, you can cut the hat according to the shape of the light. It comes with a leather fixing strap. You can sew the leather fixing strap on the hat and install the light. This combination is suitable for any work occasion that requires lighting and frees your hands. 4. Easy to use and clean: Press the button in the middle of the LED light to adjust the brightness you need. When cleaning, gently press the headlamp cap to remove the light on it, and then you can simply wash the beanie. 5. Suitable for various occasions: This rechargeable LED flashing light is suitable for different occasions, such as walking, camping, hunting, shoveling snow, fishing, cycling, running, hiking, barbecuing, car maintenance, etc. It is easy to match, and this hands - free flashlight can be applied to various occasions. 6. Material: Plastic 7. Color: Black 8. Package contents: 4 rechargeable LED lights 9. Only the above package contents are included, and no other products are included. 10. Note: Light and different displays may cause the color of the item to vary slightly from the actual product. The allowable size error is +/- 1 - 3 cm.