With dual thermoelectric and piezoelectric effect. Forms a resonant magnetic field resonates with the human body. Can effectively improve blood circulation, promote metabolism, and clear the meridians, enhance immunity. Applicable to bone hyperplasia, neck pain, joint pain and other symptoms of hyperthermia therapy. With elastic belt, safe comfortable to wear. **************************************************************************** Package Includes: Each pack Contains 1 Item based on your check out count of selection ******************************************************************************