I installed a new CO2 alarm in 2010. In the warranty it says that the CO2 alarm is good for 5 years. When it reaches its 5 years it produces an end of life alarm. This is a series or 5 chirps every minute. It then says to not replace the battery but to replace the unit.
I also replace the smoke alarms. The warranty says that they are good for 10 years.
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Jacksonville, Florida
Andover, New Jersey
The Villages
Second star to the right, then straight on 'til morning.
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