Xiaomi Smart Air Purifier 4 Pro
Breath Clean, Breath Healthy
High Efficiency Filter
PCADR 500m³/h FCADR 185m³/h , eliminate 99.97% of pet dander, dust, pollen, smoke, TVOC and fine particles as small as 0.3 microns. 
To purify a room of 165 ? only needs one hour. 
 Particles CADR (Clean Air Delivery Rate) tested by third party lab according to standard GB/T 18801 2015
 Area Efficiency equals to CADR divides height of room: (500 m3/h) / 3m = 165 m2/h
Mobile phone control with Mi Home APP to build an intelligent home scene with other Xiaomi smart products.
Works with Google Assistant and Amazon Alexa for voice command.
High Precision Sensors
PM2.5 & PM10 high precision laser sensors to detect air pollutants in real time, like dust, pet dander, pollen, VOC, and fine particles;
OLED Touch Screen
Air quality index of PM 2.5 and PM10 pollutants can be clear at a glance;
Temperature, humidity and working status displayed in real time
6 purification modes for optional operation, auto / favorite / sleep / low / medium / high
Detachable Air Outlet Grille
Top air outlet grille is dismountable for dust cleaning after lying idle for long.
Negative Ion Generator
Negative ions helps clean the air and makes you feel like in a forest or nearby a waterfall, which improves emotional well being.
Operation noise is as low as 33.7dB, just like whispering;