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.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 performancePower System: AA Batteries (not included)Colors Available: BlackRecommended hand wash only. Note: Can use a mesh wash bag for gentle machine wash.Heats 4+ HoursUnisex FitSizes Available: S/M, L/XL, XXLEstimated Heating Times:Heats up to 130F for up to 4+ hours.Material Contents:Material Content: 70% Cotton & 30% SpandexIncludes:(2) ActionHeat Cotton Blend Socks