Deep, penetrating moist heat is created by this digitally controlled unit for the treatment of pain from overuse, and tight back muscles. Warms neck, shoulders, and full back with digital 1 degree temperature control (up to 166 degree). At 12lbs, the pad delivers heat smoothly and evenly and is certain to be a favorite for you. This patent pending design covers the full back, neck and shoulders to warm up and prepare tight muscles for massage. Includes washable flannel cover and large display with digital control unit to adjust temeratuare and duration. There is an auto shut-off for safety.