ONE SIZE FITS MOST - Cevikno LED beanie hat is made of 100% stretchy acrylic material, suitable for most head circumferences and shapes (hat size: 18 * 28 cm, head circumference 55-63 cm). Provides maximum comfort and convenience, helping you withstand the cold wind. .USB RECHARGEABLE - LED light is rechargeable and detachable, no more wasting your money on batteries. You can remove it to charge via laptop, power bank, outlet, car charger, etc. It takes about 1-2 hours to fully charge and lasts 2-10 hours of working time (red light will be displayed while charging). .HANDS-FREE FLASHLIGHT - The hat with LED light with built-in and removable rechargeable 4 LED lights can illuminate a distance of up to 9 m. You can wear it outdoors for hunting, camping, traveling, running, walking, car repair, or anywhere you want to work with lighting and free your hands. .THREE ADJUSTABLE BRIGHTNESS - You can adjust the brightness by pressing the button. There are 3 levels for you to choose the most suitable brightness. It can last up to 10 hours on the lowest level, 4 hours on the medium level, and 2 hours on the highest level.