NM 4000 Jade thermal Massager reaches directly to the source of these health problems , the human root system itself. As the weight of the body pushes against the bed , the helium light bulbs heat the jade rollers and emit far infrared rays.as it move in up and down fashion along the sides of spine conforming to its natural contour, These rollers transmit a highly therapeutic form of heat and light deep into the body possessing both massage & acupressure functions.