What You Will See & Hear With This Alarm

Models with Replaceable Batteries	Models with 10-year Non-Replaceable Battery

Video: Interpret Alarm Patterns and Chirps of a BRK Alarm

Learn what different chirps and alarm patterns mean so you can quickly identify and respond to smoke and carbon monoxide alarm conditions.

What You Will Hear	What you will See	Mode of Operation
None	Constant Green (AC); Green Flash (DC)	Normal Operation
3 beeps, pause, 3 beeps	Flashes Red	Smoke Alarm Test
4 beeps, pause, 4 beeps	Flashes Red	CO Alarm Test
Soft, decending 6 tone beep	Flashes Yellow every 2 seconds until the true low-battery cycle occurs or the unit is replaced	Low Battery, Pre-Warning
1 chirp every minute	1 yellow flash in sync with the horn pattern; followed by 1 yellow flash every 6 seconds	Low or Missing Battery
3 chirps every minute	3 yellow flashes in sync with the horn pattern; followed by 3 yellow flashes every 6 seconds	If Alarm is Not Operating Properly (MALFUNCTION SIGNAL)
Soft, decending 6 tone beep	5 yellow flashes every 6 seconds until the true End of Life cycle occurs or the unit is replaced	End of Life, Pre-Warning
5 chirps every minute	5 yellow flashes in sync with the horn pattern; followed by 5 yellow flashes every 6 seconds	Alarm has reached its End of Life
4 beeps, pause, 4 beeps*	Flashes Red in sync with the horn pattern. After Alarm: Flashes Red On for 4 seconds/Off for 4 seconds. CO alarm latch is now engaged.	Alarm Levels of CO are Detected
3 beeps, pause, 3 beeps	Flashes Red in sync with the horn pattern. After Alarm: Flashes Red On for 2 seconds/Off for 2 seconds. Smoke alarm latch is now engaged.	Smoke is Detected
None	Flashes Red	Smoke Alarm is Silenced
None	Flashes Red	CO Alarm is Silenced
None	Flashes Yellow	Alarm needs cleaning

* If unit goes into CO Alarm, the regular 4 beeps brief pause cycle will repeat for 15 minutes. After 15 minutes the pause will increase to one minute.