This product has 3 patented inventions. Differentiate from the current market products that use carbon fiber heating pad, nichrome heating fabric this product uses the most advanced grapheme technology and features rapid warming within 20 seconds. When heating up, it produces far infrared ray and ultrasound wave, which resonant with the water molecules in the body cells. A human body contains 60% water. Far infrared heat can penetrate deeply into the skin, which helps the user to sleep effectively and reduce discomfort of dry eyes.