Kidde KN-COB-IC Manual page 12

Operation
Carbon Monoxide (CO) Alarm Indicator
When the CO alarm senses a dangerous level of CO, the
unit will emit a loud alarm beeping pattern. The alarm
pattern is 4 short beeps followed by 5 seconds of silence.
This cycle repeats as long as a dangerous CO conditions
exist. The red LED (Alarm) will flash the same pattern.
WARNING: For alarms equipped with 9V battery backup,
when powered by battery backup only; after four minutes,
the alarm will sound and flash only once every minute, to
conserve battery life.
If this unit is interconnected with other Kidde CO alarms,
the amber LED (Initiating Alarm) of the unit which first
detected the CO, will light and remain on until reset. The
other interconnected CO alarms will also alarm to warn
you that CO was detected.
Fire Alarm Indicator
When an interconnected Kidde smoke alarm detects
smoke, this unit will sound a smoke/fire alarm pattern of
3 long beeps, followed by 1 second of silence. This cycle
repeats as long as smoke signal persists to alert you of the
condition. If this happens, leave the premises immediately
by your escape plan and call your local fire department.
WARNING: This unit is not a smoke alarm and will not
detect smoke or fire. It will only alarm for smoke/fire if it
receives a signal from an interconnected Kidde smoke
alarm.
Note: A smoke/fire alarm will override a CO alarm
condition.
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