Carbon dioxide
Power Supply: AC adapter  9V  200mA   
Sensitivity Setting:±50ppm
Responding time: ≤30S
Warm up time:3minutes
Alarm Current: <100mA
Operation Ambient Condition: 0~60, 0~90%R.H.
Storage temperature: -20~60
Working life: 5years  
Alarm sound : ≥85DB at 10cm 
Hush function can be settled

Working indicate: 0~800PPM      Green LED light

running

800~1200PPM      Yellow  LED light running
alarm “beep” every 3minutes

1200PPM over     Red LED light runnin  
alarm “beep,beep” every 3minutes