Specifications: Electric warmer bag is comfortable surface Double safety control it will be cut off when the temperature reaches 70degrees Takes about 6 to 10mins to charge and can keep warm about 2hours The water inside can be use forever   Features: Electric Warmer Bag is made of special material It could be warm hand ,foot ,Waist and shoulder. It is 220V-50Hz, 500W,CE/ROHS certificate Auto Temperature control for safety Auto swith off when reaching 70 degrees