Just 5 to 10 minutes of electric charge gives heated pad for close above 120 minutes Strong points portable rechargeable heating pad easy to use and carry less electricity consumption easy Operation: does not require filling of water where to use rechargeable heat pad is useful for providing instant relief from pain and treatment of sports injuries, arthritis, sore neck, backache, muscular pains, cramps, hypothermia, sprains, growing pains You can keep it inside the quilt to heat up the quilt or use on low temperature for massaging body parts How to use (1) insert the power cord on the product to the socket and connect the power 1a - keep it on flat and levelled surface while charging (2) a red light (indicator) starts immediately showing heating is in process (3) after 7 to 10 minutes indicator switches off automatically (4) you can switch off charging before that also to keep the heat low (5) heat pad is ready to use (6) once heat pad is charged, it will remain hot for the period of 60 to 120 minutes Read Less