... shied helps to removes odor.Ionizer3million/cc negative ion,runs when unit works3 speed settingHigh, Med, LowQuiet noise controlHi:62dB , Low ... ,electronic buttonTimber1,2,4,8 hoursSafetyMicro-switch,automatic Shut Off When rear covers openedMaintenance1.HEPA TYPE filter replace, if not permanent ... *6000.0404.13/5.016701,4191,595 Room air purifier(open in USA)