Your smoke alarm needs replacing every 10 years! Have you checked the date?
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As is the case with the majority of our home electrical devices, smoke alarms cannot last forever. Smoke alarm sensors will degrade over time, leading to
10 Years of Alarm SAFETY then replace the sound that saves!
Smoke Alarms
Why is my smoke alarm beeping?
All smoke alarms should be replaced after 10 years
Smoke detector - Wikipedia
How Long Do Smoke Detectors Last?
Portsmouth Township Fire Department
Your smoke alarm needs replacing every 10 years! Have you checked
Smoke Detector Chirping? 16 Possible Causes and Fixes - Bob Vila
Replacement for Ei166, Ei166RC or Ei166e Mains Powered Smoke Alarm
First Alert Smoke Alarm FAQ
Why do smoke alarms keep going off even when there's no smoke?
