This double-sided air purifier uses H13 true HEPA filter with 400 m鲁/h CADR to clean 3000 sq ft spaces hourly. It has PM2.5 sensor and real-time AQI display, auto-adjusts fan speed, reduces smoke, pet odors, dust and dander. It features remote control, timer, filter life monitor, child lock, 15dB sleep mode, aromatherapy and all lights off for quiet use. Certified by ETL FCC EPA CARB with washable pre-filter for long-lasting use.