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DorWatcher 12VDC / Mains/Battery Powered Door Held Open Alarm Fire System Set Time Delay Sounder Screecher (DW306 Mains Powered) : Amazon.co.uk: DIY & Tools
DorWatcher 12VDC Mains Battery Powered Door Held Open Fire Alarm Set Time Delay Screecher Sounder HDSDI Group
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