The ActionHeat 5V Battery Heated Cable Knit Hat is designed to keep your head warm when during winter activities. Featuring a stylish design, the hat traps your head's natural heat, you will love the extra comfort of strategically placed heating panels on both ears. Once the cable knit hat is powered on, the heating elements quickly heat up your ears and head in just a few seconds. The rechargeable 5V lithium-polymer batteries deliver 3 levels of heat, controlled by the temperature controller on the hat. The hat can reach a maximum temperature of 130F while lasting up to 4.5 hours.