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Kidde Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Battery Door, Smoke Alarm 21029877 - The Home Depot
Kidde Hard-Wired w/Battery Back-up Photoelectric Smoke and Carbon Monoxide Detector - Walmart.com
Analysis of the smoke detector battery and how to replace it-Tycorun Batteries
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Kidde Wireless Smoke Detector, AA Battery Operated (Included), Ionization Sensor Wire-Free Interconnect Smoke Alarm - Amazon.com
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Smoke or CO Alarm Expiration Dates: Frequently Asked Questions
