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DETA 1151 smoke alarm, interconnected. Beeping and light confusion! - Smoke Alarms - Safelincs Fire Safety Forum
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Deta 1163 Optical Smoke Alarm 240V with 9V Replaceable Battery Back Up (White) : Amazon.co.uk: DIY & Tools
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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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