Lifemall SF USB Powered Heated Scarf Warming Scarf Comfort Warming Scarf With Warm Pockets The heating sheet without electric power storage ,heat when charging ,it powered through USB connection,works with any device with USB port The temperature no more than 45 degrees centigrade,only heats in heating sheet,soft and cozy fabric warm your neck with comfortable temperature Smooth, comrotable touch feelings integrated hand pockets Light weighted, flexible, foldable, hand washable, and evenly heat distribution Size:58.3"X7.5" Wight:9.4oz