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Aico EI146e Set of 2 Mains Hard Wired Smoke Alarms with 9V Battery Back Up , White : Amazon.co.uk: DIY & Tools
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Can you replace a hard-wired smoke detector with a battery one, and vice versa? If so, how does that work exactly? - Quora
How to Replace Hardwired Smoke Detector – Safely Update Your Smoke Detectors with Kidde FireX - YouTube
Does your smoke alarm need replacing? :: Derbyshire Fire and Rescue Service
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How to Install Hardwired Smoke Detectors
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Kidde Smoke Detector, Hardwired Smoke Alarm with Battery Backup, Test-Silence Button - Walmart.com
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Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - Kidde Firex KF-R Series
