①
Power ON/OFF
: Press and hold the button for 3
seconds to turn the device on/off.
②
Alarm Function
:
After startup, press the button once to turn on the LED
light. It remains white light when the detected CO
2
concentra-
tion is below 1000 ppm, and turns red when the detected CO
2
concentration exceeds 1000 ppm.
Press the button again to enable the alarm sound. The
icon will disappear from the screen. When the detected CO
2
concentration exceeds 1000 ppm, it will sound five times
every 15 seconds.
Pressing the button for the third time can turn off the
alarm sound and LED light. The icon will reappear on the
screen.
Whether the CO
2
value exceeds the standard is indicated by
the LED light, as shown in the following table
:
White Light
Good
400-999ppm
No Alarm
Red Light
Bad
over 1000ppm
Alarm 5 times every 15s
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