No more heating problem ( lack of heat ) New features add on with negative ion, aromatherapy, etc.. Speed up sweating effect at short time period Super conductive fir carbon fiber heating element ( walls panel ) Super conductive fir carbon fiber heating element ( foot pad ) Fir ceramic heater with self automatic temperature preset control ( fir radiant heat blower ) Maximum heating temperature of 62 c ~ 65 c, at room temperature range ( above 23 c ~ 28 c ),2 minutes heating temperature reach 59 c or above Maximum heating temperature of 60 c ~ 63 c, at room temperature range from ( 12 c ~ 19 c ),3 minutes heating temperature reach 59 c or above Maximum heating temperature of 55 c ~ 59 c, at room temperature range from ( 2 c ~ 10 c ),5 minutes heating temperature reach 54 c or above Portable far infrared fir negative ion sauna 2 sizes& variable design available in fabric& leather.. Functions include far infrared(fir), negative ion and electronic pulse massager. Super large size:110(h)x80(w)x84(l)cm Regular size:98(h)x68(w)x80(l)cm