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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
Can you replace a hard-wired smoke detector with a battery one, and vice versa? If so, how does that work exactly? - Quora
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Deta 1163 Deta Protect Mains Powered Optical Smoke Alarm With Hush, Alkaline Battery Back Up & Push Fit Base 240V - Shop4 Electrical
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