With DC motor.
With LED display.
Touch panel control.
4 stages 360°cylindrical filter system effectively removes PM2.5, formaldehyde and other harmful substances: Mesh PP filter to collect big particles and to prolong the lifetime of HEPA; True 99.97% HEPA to filter the floating particles and pollen with little wind resistance;Efficient activated carbon filter to eliminate the strange odor, to filter the methanal and TVOC
Adjustable speed in turbo, high, medium, low levels.
Sleep mode to provide a quiet and pleasant environment at night. 
12 hours timer setting(1-12 hr). 
Filter changed indicator. 
Automatic switch off when change filter.
Auot mode to automatically adjust the fan speed according to air quality. With high-precision sensor to report air quality PM2.5 data and indicate in different color.
Long distance 433MHz RF remote controller.(Optional)
Built-in ionizer to release negative ions;(Optional)
WIFI function.(Optional)