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Firehawk Mains Powered Optical Smoke Alarm (Battery back-up)
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Aico | EI141RC | Buy Online Now at Medlocks.co.uk
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How to Change a Battery in a Smoke Detector
Ionisation Smoke 770MRL Smoke Alarm – Mains Powered by BRK
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Photoelectric 230-volt Smoke Alarm with 9-volt Alkaline battery back-up - Brooks
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The dos and don'ts of mains powered smoke alarms and battery alarms | LABC
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