Targeted heat therapy: Sunbeam heated back wrap is uniquely designed to provide targeted back pain relief by contouring to the shape of the backStays in place: The electric heating pad wrap stays in place with a comfortable, adjustable waist strap that extends up to 85 inches around, so you can get relief hands freeClinically proven treatment: Heat is clinically proven to relieve pain associated with muscle tension and stress; It increases blood flow to the source of the pain, which accelerates tissue healing.Wattage:55 WMoist heat option: Spray this sunbeam heating pad with water to provide deep penetrating pain reliefConvenient design: Features 4 heat settings, 2 hour auto off for peace of mind, and a long, convenient 9 foot cordMachine washable pad: Super soft, micro mink fabric is machine washable; Simply disconnect the pad from the cord and place in the washing machineGel packs will remain cool or hot for approximately 30 minutes to 2 hours, depending on variables such as air temperature.