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. Infrared heat can penetrate deeply into skin, which help the user to increase blood circulation and relieve hand pain.