The Lifelong Electric Hot Water Bag is a pouch filled & sealed with special gel, used to provide warmth, typically whilst in bed, but also for the application of heat to a specific part of the body. It relieves you from body pain and cramps. It also helps in keeping you warm in cold climatic conditions. This hot water bag is filled with a special gel which saves the hassles of heating water in separate vessel. Just plug in the charger and let the hot water bag get heated completely.