Universal size: This LED beanie is made of super soft and excellent insulating acrylic mixed material. This winter warm LED knitted hat can fit most children, men and women's various head shapes, with high elasticity. It is an ideal holiday gift for friends and anyone in the family. Longer battery life: 4 built-in LED beanies with 3 brightness settings, upgraded 250 mA battery capacity, and full brightness (110 lumens). The continuous use time is up to 10 hours, low, 3 hours, and high 2 hours (the running time is much longer than other lighted beans on the market). USB is rechargeable and easy to use: Standard USB is provided, and it can be charged through any standard USB port. It can be charged with a car charger, computer, socket, mobile power supply, etc. The light will turn red when charging, and it will turn green after about 2 hours of charging. Convenient to load and clean: just pull the edge of the sock cap and push the lamp inward to separate them and clean the cap or charge the lamp. The 4 LED lamps have high-quality IP44 waterproof rating, and there are three (3) Adjust the brightness setting, you can have the perfect light for any task. Use it everywhere: it is an ideal headlamp cap for winter runners and outdoor adventurers. Wear it for running, camping, hiking, hunting, jogging, snow shoveling or partying. Illuminate your way in the dark and enrich your quality of life.