This is the back cushion that attaches to a chair and delivers a deep tissue Shiatsu massage. Each of its four massage heads rotates to loosen tight muscles while an integrated heating element encourages blood flow. The massager can be easily positioned along a chair's back to target hard-to-reach areas, with the intensity of the massage controlled by how hard you press your body against it. The massager can also be used to target other body parts such as thighs or calves. Simple one-button operation lets users choose massage with or without therapeutic heat. With 20-minute automatic shutoff. Not for use with pacemakers. AC plug. Massager 12" L x 8" W x 4" H. (2 1/2 lbs.)