Controlled moist heat for temporary pain relief associated with muscles strains and sprains, joint pain and inflammation. Temporarily eases back pain caused by overexertion, stress and strain Does not require water - produces its own moisture using humidity in the air. Easy-to-read LCD controls allow user to set and monitor treatment temperature and time Lock-out feature guards against unintended touching of the controls during treatment. Includes heating pad, fleece cover and instruction manual. One-year warranty 14" x 27" Note: For health and hygiene reasons heating pads are not returnable once used.