NOTE: These are REPLACEMENT heated socks only. They do not include batteries or chargers.The ActionHeat battery heated socks are the perfect blend of quality and comfort. The ActionHeat socks reach a maximum temperature of 130F and can last up to 4 hours. HOW TO USE: Power Up - Insert (3) AA batteries into each power pack (not included) Plug-In - Connect the power pack to the cord located in the pocket on the top of the sock. Turn On - Press the red power button on the power pack to turn on. Features: Built-In heating panels strategically placed on the top of the toes use advanced ultra-fine fibers to provide superior heating performance Power System: AA Batteries (not included) Colors Available: Black Recommended hand wash only. Note: Can use a mesh wash bag for gentle machine wash. Heats 4+ Hours Unisex Fit Sizes Available: S/M, L/XL, XXL Estimated Heating Times:Heats up to 130F for up to 4+ hours.Material Contents:Material Content: 50% Wool, 48.5% Cotton & 1.5% SpandexIncludes:(2) ActionHeat Wool Blend Socks