... warming fast, wear-resisting, etc7.Health effects The product uses the carbon fiber heater which can realease far infrared ... ,expand capillary, eliminate microcirculation dysfunction, promote metabolism,make the skin exquisite, prevent moisture, prevent germs, delay senescence8 ... new batteries should be charged for 12 hours at the first three times.Inserting 220V household power . FIR ourdoor sport ...