This portable, rechargeable heating pack helps keep yourself warm and ease your aches and pains, quickly and easily. There is no need to fill or replace water, as its pre-filled with Galvan OT Emy energy conversion gel. Simply charge it for 7-12 minutes and get warmth and relief from 2-10 hours. Once desired temperature is reached unplug the charger, else it will automatically shut off at 75 degrees Celsius. It is designed with simplicity and safety in mind. It helps ease pains such as arthritic, toothache, arthritis, headache, back and neck pain, chilblain.