Kosmodisk classic Spine Massager & Lower Back Massager. Heats, soothes and relaxes tired muscles, comforts aches and pains. Exercises created to relieve and prevent back pain. Color - As same as picture. The massaging effect of Kosmodisk stimulates the muscle close to the spain area. That in turn generates warmth which cases blood-circulation which soothes your muscles and reduces tension. The Kosmodisk does not use any additional energy sources such as magnetos batteries. It works as long as it shape remains undamaged.