Suitable for most hats, complete combination for easy illumination in ; This LED lamp has 3 adjustable brightness , namely, strong, medium and weak light modes; can the most appropriate brightness to make in the dark USB charging: the flashlights have standard USB, which can be through any standard USB port; You can use car charger, computer, socket and portable to charge; The indicator will turn red when charging and green when fully , easy and convenient to use Easy to install and replace: if you have LED knit beanie hat, just remove the broken head light lamp and replace with LED head light lamp; If your hats are without LED lights, you can cut the hats according to the shape of the light; Equipped with leather traps, you can sew the leather traps on your hat and install the lights; This combination is suitable for anywhere you work lighting while freeing your hands Simple to apply and clean: press the button in the middle of LED light to adjust the brightness you ; cleaning, gently press the head light lamp cap to remove the lamp on it, and then you can wash the beanie hat simply Suitable for many occasions: this LED rechargeable flashing light is suitable for different occasions,like walking , camping, hunting, shoveling snow, fishing, cycling, running, hiking, barbecue, car maintenance, etc.; Easy to match, the hands free flashlight can be applied in a of occasions Material:plastic colour: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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.