From the US Consumer Product Safety Commission:
Kidde Recalls Combination Smoke/CO Alarms Due to Alarm Failure
Name of product:
Kidde NightHawk combination smoke/carbon monoxide (CO) alarms
Hazard:
The alarm can fail to continue to chirp when it reaches its seven year end of life if the batteries are replaced, leading consumers to believe it is still working. This poses a risk of consumers not being alerted to a fire or CO incident in their home.
There is a link to the Kidde website to get a free replacement. Also, for those living in my area, Fire District 14 will install a free smoke alarm in your house - contact them for more information.

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