MASSAGE HAMMER our massage head integrates 3 innovative functions: infrared ray, magnetic therapy & hammering massage. of infrared rays directly function on the surface of your body, if combined with heating, the massage result will be even apparent. powerful magnetic field can strengthen the functioning of blood vessel & improve metabolism. the massage head is made of hightech engineering plastic enabling more powerful hammering. With a step-less speed adjustment device, you can choose any speed you like.