3 Stage Filtration System: Pre-filter, True HEPA filter, Activated carbon filter. It removes 99.97% of dust, pollen, smoke, odor, allergens and pet dander. 100% ozone-free. Sleep Mode & Night Light: Set purifier to sleep mode to ensures its quietest running and set optional night light to produce fresh air without disturbing noise and light while you sleep. Air Quality Monitor & Auto Mode: Air quality indicator alerts you the current air quality level and adjusts airflow speed automatically according to the air quality while in auto mode. 3 Fan Speed & Auto Off Timer: 3 adjustable fan speed meet your needs whether for faster purification or quiet operation. Set auto off timer when you want your purifier to turn off automatically after 1, 4, 8 hours. Covers up to an average to a large living room of 376 sq.ft (35 m²); CADR Rated 120+, refresh your air in 10 minutes with noise level lower than 56 dB. Portable size and elegant design make it a perfect companion for rooms or office. It's recommended to replace the filter every 6 months or sooner(depending on usage),the replacement filter is available for purchase (search for Asin B07KQK2474). Two-year warranty and lifetime support. Note: please remove the plastic bag of the filter before runnin