This product is a new style “hot water bottle” made from modern materials. Designed to retain heat for longer periods than conventional hot water bottles, it is re-heated electrically from a household power outlet. Provides convenient even warmth and increased comfort for extended periods of time. The electric hot water bottle is one of a new generation of health and comfort products designed to provide pain relief for arthritis, body aches, back and neck pain, and even a toothache. It will replace your old-fashioned hot water bottle. Unlike conventional hot water bottles, this heats electrically in only 15-20 minutes and stays warm for 2 to 5 hours. This product incorporates a safety design that uses a thermostat to automatically turn the unit off when it reaches a temperature of 140-160 degrees Fahrenheit (60-70 degrees Celsius) This product has a built-in pressure protect switch to automatically turn the unit off if the unit expands abnormally.