Tourmaline is natural jewelry, it is also a kind of dielectric medium with piezoelectric effect and pyroelectric effect. When tourmaline is motivated by heat or pressure, it releases free electrons and ions. Besides, it can also radiate far infrared light(wavelength is 4~14um) which is beneficial to human health. Therefore, tourmaline is widely used to make electric heating tourmaline waist belt, tourmaline mattress, tourmaline cushion and so on.