Features Model Number: SHPFPP40 Clean Mode is functioning when the indicator light is blue which signals that both positive and negative ions are being emitted into the air Ion Control Mode emits additional negative ions in this mode Pre-Filter is the initial filter that traps dust and other airborne particles True HEPA Filter traps 99.97% of particles as small as .3 microns and will last up to 5 years Washable Active Carbon Filter helps remove odors and will last up to 5 years Odor Sensor detects foul smells and other odors Manual Operation allows the user to choose between 4 fan speeds and pollen mode Timer can be set for 1, 4 or 8 hours if desired