Thank you for viewing. This is a brand new, unopened, and authentic product. It will be shipped via Yu-Packet Post. Thank you for your consideration. ※ Returns and exchanges are not accepted. ------ This product efficiently supports the two-handed swinging exercise (Swai Shou) and contributes to health promotion. Because of its high far-infrared radiation efficiency, it can efficiently supply the energy generated by the two-handed swinging exercise to the human body. (From the instruction manual)