User's Manual

6.Know LED display on the viewing window
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5.Clean the pre-filter
There is an LED backlight on the viewing window (three colors of red, blue
and green respectively), and the color of the light is automatically displayed
according to the number of PM2.5: (0-49 green light, 50-99 blue light, more
than 100 red light) At the same time, green light indicates excellent air
quality, blue light indicates good air quality, and red light indicates poor air
quality.
A vacuum cleaner can be used to regularly clean dirt on the pre-filter, or it
can be washed and dried for further use.