--2.Filter:
Filter the dust particles into the indoor air to achieve high quality indoor air.
--3.Speed:
The wind speed can be adjusted according to the demand.
--4.Sensor:
Temp、Humi、CO2、TVOC、PM2.5 Sensor etc.
--5.Control button:
On-Off button、Speed、Auto、Timer、Sleep、Sterilize、Restore.