Specification:
Brand new
Color: white
Power: 3*AA batteries (Not include)
Sensitivity & Time: 30ppm, Alarms within 120 Minutes
Sensitivity & Time: 50ppm, Alarms within 60~90 Minutes
Sensitivity & Time:100ppm, Alarm within 10~40 Minutes
Sensitivity & Time: 300ppm, Alarm within 3Minutes
Alarm within 3Minutes Standby Current: <80uA Alarm Current: <80mA Operation Ambient Condition: 5℃~40℃; 20%~90%R.H Display tolerance: +/-100PPM (0-200PPM);+/-50%(>200PPM )

Features:
Easy installation, no need to debug.
LCD Display with a blue ground Light.
Loud 85 decibel alarm with LED Flash While in the Alarm Mode.
Precise electro-optical sensor, high consistency and stability.
Permanent carbon monoxide sensor. Loud 85 decibel Bleeps alarm. The alarm sound pattern is four short alarm beeps.
The red LED will flash while in the alarm mode. One chirp every 30 seconds if the battery is low(need replacement) (green LED still flashes once every 30 seconds).
Test/Reset button to test the unit electronics and verifies properunit operation and reset the unit during CO alarm.
Alarm memory feature: If the unit ever alarms, pressing the button,green LED will flashes once every second for one minute. And the peak alarmlevel will be indicated on the LCD.
Green and red LED lights that indicate normal operation and alarm status.
The unit will sound chirp and red LED flashes once as power up.Green LED: Flashes every 30 seconds to indicate the unit is operating properly.
The green LED will also flash before CO reading is taken and when any button is pressed.Red LED: When a dangerous level of carbon monoxide is detected the red LED will pulse and a loud alarm pattern will sound. The alarm pattern is 4 short beeps, followed by 5 seconds of silence, followed by 4 short beeps with a corresponding red LED flash.
This cycle will continue for 4 minutes and then change to 1 cycle everyminute until the device is reset or the CO is eliminated.

Package included:
1 x carbon monoxide alarm
2 x screws
1 x user manual