One size, knitted cap with 4 built-in and rechargeable LED lights, illuminates at a distance of up to 10 m. This LED hat is reversible, you can wear it inside out. Just take the LED headlight out, change it anytime, anywhere. Closure: Pull On Polyester Great for fishing, skiing, camping, hiking, hunting, jogging, building or just for fun. Includes a standard USB port to charge the battery, you can charge it in the car charger, computer, portable power bank, up to 4 hours of continuous use or 68 hours of realistic temporary use.