Suitable f most hats, complete combination f easy illumination in ; This LED lamp has 3 adjustable brightness , namely, strong, medium weak light modes; can the most appropriate brightness to make in the darkUSB charging: the flashlights have stard USB, which can be through any stard USB pt; You can use car charger, computer, socket ptable to charge; The indicat will turn red when charging green when fully , easy convenient to useEasy to install replace: if you have LED knit beanie hat, just remove the broken head light lamp replace with LED head light lamp; If your hats are without LED lights, you can cut the hats accding to the shape of the light; Equipped with leather traps, you can sew the leather traps on your hat install the lights; This combination is suitable f anywhere you wk lighting while freeing your hsSimple to apply 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, then you can wash the beanie hat simplySuitable f many occasions: this LED rechargeable flashing light is suitable f different occasions,like walking , camping, hunting, shoveling snow, fishing, cycling, running, hiking, barbecue, car maintenance, etc.; Easy to match, the hs free flashlight can be applied in a of occasionsMaterial:plasticcolour:blackPackage Contents:4 rechargeable LED lightsOnly the above package content, other products are not included.Note: Light different displays may cause the col of the item in the a little different from the real thing. The measurement allowed err is 1-3cm.