Threshold Settings
- Temperature threshold
- The device will upload the current data once instantly when temperature is over
or below the threshold. Only when the threshold is released and triggered again,
the device will report the threshold packet again.

- CO2 threshold
- The device will display the Excellent,
Polluted and Bad threshold status via LED indicator and the emoticon on the
screen. Besides, when it exceeds the Bad threshold, the device will
upload the current data once instantly.
