LARGE COVERAGE: The air purifier is perfect for large, indoor spaces, especially large bedrooms. The air purifier has a powerful filtration system that can remove particles as small as 0.3 microns, including dust and pollen. It can purify the air of a 1300 ft² space once/hour (based on AIRTOK Original Filters; not applicable to other replacement filters) HEPA SLEEP MODE: When in Auto Mode, the AIRTOK air purifier will automatically adjust the fan speed to protect your air quality while you rest. AIRTOK Original Filter is HEPA-grade while operating in Sleep Mode, as tested by an independent lab SMART AIR PURIFIER: AIRTOK air purifier has a PM 2.5 Display & Air Quality Sensor which will monitor the air quality in real time and feed it back to the display screen.