The ActionHeat 5V Battery Heated Hand Warmer Muff keeps your hands warm and comfortable during cold-weather activities. Designed with an extra large built-in heating panel, it delivers consistent heat for up to 5+ hours. The soft, water-resistant outer shell and adjustable strap provide durability and comfort for outdoor use. With touch-button technology and three easy heat settings, this rechargeable muff ensures your hands stay warm whether you are walking the dog, attending a game, or working outdoors.