This product has 3 patented inventions. Differentiate from the current market products that use carbon fiber heating pad, nichrome heating element this product uses the most advanced grapheme technology and features rapid warming in 20 seconds. When heating up, it produces far infrared ray and ultrasonic wave to resonant with the water molecules in the body cells. A human body contains 60% water. Far Infrared heat can penetrates deeply into the skin, especially to the uncomfortable area, such as women’s period pain, that can all be relieved by the far infrared rays.