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FireAngel Optical Smoke Alarm with 10 Year Sealed For Life Battery, FA6620-R-T2 (ST-622 / ST-620 replacement, new gen) - Twin Pack , White : Amazon.co.uk: DIY & Tools
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FireAngel smoke alarm (bottom) and carbon monoxide detectors as fitted in modern caravans/ motorhomes fitted high up as the gases are lighter than air Stock Photo - Alamy
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