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 darkUSB 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 useEasy 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 handsSimple 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 simplySuitable 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:plasticcolour:blackPackage Contents:4 x rechargeable LED lightsOnly 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.