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X-Sense Wireless Interlinked Smoke Alarm, Mini Smoke Alarm for Home, 820 ft Transmission Range, Replaceable Battery-Operated Interconnected Fire Alarm, EN 14604, XS01-WR (RF Interconnected), 6-Pack : Amazon.co.uk: DIY & Tools
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Radio-Interlinked Sealed Battery Powered Smoke & Heat Alarms - Hispec RF Pro Range - From £29.27 inc VAT
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