Features:
Loud 85 decible alarm.
Permanent carbon monoxide sensorPowered by one 9V battery (Carton Zine 6F22 or Alkaline 6LR61).The alarm sound pattern is pulsed three alarm beeps.This continues until the CO eliminated .The red LED will flash once every one second while in alarm mode.
Test button to teat the units electronics and verified proper unit operation RED LED light flashing once every 40 seconds to indicate normal operation mode.The CARBON MONOXIDE (CO) alarm monitors the air for the presence of CO.The alarm will sound and be accompanied by the flashing red LED light when there are high levels of CO present.

Specification:
Power Supply:9V alkaline battery 6LR61
Sensitivity Setting : 150+/-50ppm CO concentration
Standby Current:<35Ua
Alarm Current :<20Ma
Operation Ambient Condition:4~38Celsius degree , 25~85%R.H.