TRUE HEPA TECHNOLOGY – The air purifier filters particles as small as 0.3microns and larger, the pre-filter, HEPA filter and activated carbon filter capture dust, pollen, smoke, odors, mold spores, and pet dander, helping to fresh the air and improve overall health. HIGHER PURIFY PERFORMANCE - The air purifier hepa covers an area of up to 376 ft²/ 35㎡and the CADR number is 120 m³/h, making it perfect for large rooms and offices. 4 FAN SPEEDS with AUTO MODE – The air purifier for home comes with 4 Fan Speeds, which allow you to adjust the fan speed from low, medium, or high and turbo. When set it into auto mode, it will adjust the fan speed according to the air quality. SLEEP SILENT MODE - The noise level is nearly voiceless at sleep mode with only 25db, so you can enjoy the fresh air while you have a quiet sleep. CERTIFIED for SAFER – Ozone-free, Complies with California air resources board (CARB) for indoor cleaning devices, and ETL Listed. (Please replace the filter at least once each 3 to 6 months, Search APKIT-20F to purchase the replacement filter)