The ActionHeat Battery Heated Slippers are the only open back heated slippers on the market that runs on AA batteries. They are perfect lounging around the house on a cold winter night. ActionHeat Slippers run on (6 Total) AA batteries and will heat up to around 120deg. HOW TO USE: Power Up - Unzip slipper and insert (3) AA batteries into power packs Plug-In - Close power pack and re-zip Turn On - To activate heat, click the red button Features: Comfortable Heated Toes Weather-resistant fleece & cozy fleece lining provides warmth, comfort, and versatility Strategically placed heating elements use ultra-fine fibers for optimal heating performance An integrated heating system located on the bottom of the foot Heating panels encapsulated with a thermal seal provides additional durability & moisture protection Estimated Heating Times: High (Red): 120F - 4+ Hours Material Contents: Weather-resistant plush fleece A layer of advanced Thinsulate insulation A thermal seal provides the heating system with durability & moisture protection Includes: (2) ActionHeat AA Slippers