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This video shows you how to get rid of the end of life battery chirp noise on the Honeywell H450EN CO Detector by turning it off. This unit has also been rebadged for British Gas so these instructions will work for that unit as well. The front looks the same. The unit enters the battery chrip mode after about 7 years, but as it has sealed in batteries they cannot be removed and it is a good idea to put the unit into a silent off mode for disposing.As always Please replace the detector as they do keep you safe and well, ultimately they save lives.