Product description:

Gas detected: Carbon monoxide

Sensor: electrochemical carbon monoxide sensor
Detecting range: 0~999PPM*
sensitivity: 5PPM

Power supply: 110VAC(   )     220VAC(   )  230VAC-240VAC(   ) 
Backup battery: 1X9v(   ) 1 X12v(   )

Numerical readings and notes: 3-digit LCD display of levels
Normal reading: 0
Alarm readings: 30～999PPM
Battery capacity display:  full, OK, low, dead
Sensor performance display: malfunction
Alarm mode:  sound: beep,  hummer
Light: red LED flashing
Installation: wall & table