Brand: Philips Model: AC2887/30 Numerical air quality feedback Certified or tested by ECARF and Airmid* Four-step color indicator shows quality of air Aerodynamic architecture boosts efficient airflow Healthy air lock and alert for filter replacement Automatically monitors, reacts & purifiers the air Low noise at Sleep Mode (20.5dba) - soft as a whisper 3 auto modes: General, Allergen, and Bacteria & Virus Smart light control: adjust light to suit your preference VitaShield naturally purifies UFP as small as 0.02microns 1 year Warranty