Xiaomi Smart Air Purifier 4 Pro, PCADR 500 m3/h, MI Home, OLED Display, Night Mode, coverage 35-60 m2, BHR5056EU, White High efficiency filter PCADR 500m3/h & FCADR 185m3/h, removes 99.97% of pet hair, dust, pollen, smoke, TVOC and fine particles up to 0.3 microns (less than 1% of the diameter of a hair). It takes only one hour to purify a 165 m2 room. Smart Control Control from your mobile phone with Mi Home APP to build a smart home scene with other Xiaomi smart products. Works with Google Assistant and Amazon Alexa for voice control. High-precision sensors High-precision laser sensors PM2.5 and PM10 for real-time detection of air pollutants such as dust, pet hair, pollen, VOCs and fine particles. OLED touch screen The air quality index of PM 2.5 and PM10 pollutants can be clear at a glance; Temperature, humidity and operating status displayed in real time; 6 purification modes for optional operation, auto / favorite / sleep / low / medium / high; Detachable air outlet grille The upper air outlet grille can be disassembled for dust cleaning after a long period of inactivity. Negative ion generator Negative ions help clean the air and make you feel like you are in a forest or near a waterfall, which improves emotional well-being. Silent operation The operating noise is only 33.7dB, like a whisper;