The Theratherm Digital Moist Heating Pad provides temporary relief from pain associated with arthritis, back pain caused by muscle spasm and inflammation caused by strain and tension. Theratherm moist heating pads, as opposed to dry forms of heat, draw moisture from the air and retain it in a specially designed, flannel cover. The retained moisture is rapidly heated by high-grade ceramics allowing deeper penetration of heat into the body's tissue. Plus, Theratherm Digital Moist Heating Pads are easier to use than other electric heating pads on the market due to their unique programmable digital hand control. The Theratherm Digital Moist Heating Pad has a timer that can be set from 1 to 30 minutes.