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electrical - Can you run an individual wire to link smoke detector together? - Home Improvement Stack Exchange
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First Alert 10-Year Battery Hardwired Ionization Sensor Smoke Detector in the Smoke Detectors department at Lowes.com
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FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com
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How to Install Hard Wired Smoke Detector - Easy Installation First Alert Smoke Detector Model 9120B - YouTube
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Kidde Smoke Detector, Hardwired Smoke Alarm with 9-Volt Battery Backup, Test-Reset Button, Interconnect Capability, 2 Pack - Amazon.com
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