Designed to cover up to 330 square feet--With a CADR rate of 147 CFM (250 m³/h), this air purifier circulates air in rooms up to 330 sq.ft (30 m²) three times per hour, the ideal size for a living room, family room, master bedroom, or large office. There's no harmful Ozone, ideal for anyone especially children and asthma sufferers helpful for everyone especially for the children and asthma sufferers Advanced 5 stages Filtration System--Comes with 4 filters: washable pre-filters, charcoal filter, activated carbon filter with antibacterial coating, and true HEPA filter. Effectively eliminates 99.97% of airborne pollutants like pet dander, dust, smoke, pollen, allergens, odors and particles as small as 0.3 microns. Independent replacement indicator for each filter, allows you to replace each filter without replacing the entire set, making it convenient and economical (Search RP-AP002 filters) Smart Auto Mode & Air quality Light indicator--The built-in smart air quality sensor communicates the state of air quality in real time, the air purifier will automatically change colors of Air Quality Light and adjust fan speeds based on the air quality it senses, to clean your air and increases air circulation effectively. The light can be closed manually if you prefer to sleep in total darkness Quiet Operation with 3-Speed and Timer Settings--Three fan settings let you control the speed and volume of the purifier. Set it to sleep mode for ultra-quiet operations (35db). Set the timer to auto-shut-off to conserve energy while you sleep. Child lock mode prevents operation errors from children or pets Safe & Certified--No UV-C, No harmful Ozone. Intertek ETL certified, CARB (California Air Resources Board) and CA PROP 65 certified. US-based office. Note: please remove the filter's plastic packaging before using your air purifier