AIR FILTRATION SYSTEMTriple filtration stages: anti-dust pre-filter, HEPA filter against the small particles, active carbon filter.IONIZERThe IONIZER neutralizes the particles of dust, pollen and smoke contained in the air.IONIZER: it neutralizes the particles of dust, pollen, car fumes and smoke contained in the airHEPA FILTER: effective against dust particles as small as 0.3  in diameter or biggerCARBON FILTER: effective against various harmful gases thanks to the property of active carbonsWashable re-usable PRE-FILTER3 FAN SPEEDSTimer off 1-2-4-8 hours Filter dirty indicator: after 720 hours of use the machine advices that the 2in1 Hepa+Active Carbon filter needs to be replacedControl panel with SENSOR TOUCH SCREEN