PM 2.5 SensorDetects pollutants and timely reports what’s happening in the air 24/7. | Adaptive SenseDreo air purifier adapts to air quality conditions, purifying faster and saving farther. | Smart CareH13 true filter life gets maximized by the Smart Care algorithm. | PureSilent TechnologyIn sleep mode, Macro Pro reduces noise to work almost undetected by the human ear. |