HiSpec Mains Powered Smoke Alarm and Heat Detector Kits with 9V Battery Backup: 4 Smoke/1 Heat/1 CO | DIY at B&Q
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ANSMANN Smoke Detector Battery Replacement [Pack of 2] Square 9V E-Block Batteries For Smoke / Fire Alarm Replacements With 7 Years Life Time, Red: Amazon.co.uk: Electronics & Photo
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HiSPEC HSSA/CO/FF Mains Power INTERCONNECTABLE Fast Fix Carbon Monoxide Detector + 9v Backup Battery | westbasedirect.com
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Hispec Interconnectable Fast Fix Mains Smoke Detector with 9v Battery Backup Included | Express Electrical
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