FireAngel Carbon Monoxide Detector & Alarm with 1 Year Replaceable Batteries (Twin Pack) | Homebase
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10 Year Longlife Battery Radio-Interlinked Carbon Monoxide Alarm - FireAngel Pro Connected FP1820W2-R
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Fireangel FA3322 Digital CO Alarm with 10 Year Sealed For Life Battery & Optical Smoke Alarm with 10 Year Sealed For Life Battery, FA6620-R, White : Amazon.co.uk: DIY & Tools