Have lived in our home over 23 years and have not had CO detectors until now. So our hope, of course, is we will never see how well they (we purchased 2 Kidde AC/DC Carbon Monoxide Alarms) truly work. It is encouraging that the green indicator lights on both units are working. The test button seemed a bit slow to respond on both units, at least initially. Instructions say to test weekly, so we will see how they respond in the future. The size is about what I expected and they are not too obtrusive in the outlets we've chosen. I plugged them in the lower plug of a standard double outlet so as to be able to access the outlet above for other appliance needs. Hope this info is helpful.
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