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. Fit & Design: Heating elements quickly heat up your ears and head in just a few seconds Rechargeable 5V lithium-polymer batteries deliver 3 levels of heat, controlled by the temperature controller on the hat Can reach a maximum temperature of 130F Lasts up to 4.5 hours