The Back Warmer Pad can provide up to 2 hours of heat before gradually cooling down to room temperature. It fits perfectly in the small of the back when sitting or across the upper back when lying down. The Back Warmer Pad comes with a belt, holding heat longer while allowing the pad to be strapped to specific areas of the body - without constricting mobility. Quick and easy to use, the Back Warmer Pad is the next generation of hot water bottles and traditional heat pads. Totally versatile, the Back Warmer can be used in many parts of the body - wherever heat relief is needed. Excellent relief for: - Back pain. - Menstruation pain. - Spine and Lumbar area pains. - Arms, Legs, hands, knees and elbows pain. What's in the box Reuseable Back with Belt Heating Pack