King Size Moist/Dry Heating Pad, 12" x 24". Perfect size to treat the entire back region: Soft blue cover for penetrating deep heat relief. 3 Power Levels: Low, Medium, High. 7.5 Foot Power Cord. 1 year limited warranty. The Penetrating heat dilates the blood vessels, increasing circulation and removing toxins from injured areas. This is a dry heating pad that comes with a moist sponge insert that you can wet for deep, fast acting moist heat. Caution: Read All Instructions and Warnings Before Using!