I have a Kidde battery powered model that includes a digital readout,
which I find useful. I can tell at a glance if levels are present or
rising, long before the alarm sounds. A good set of batteries lasts many
years.
<https://www.amazon.com/Kidde-Battery-Operated-Carbon-Monoxide-Digital/dp/B004Y6V5CI/ref=lp_495272_1_5?s=hi&ie=UTF8&qid=1511878074&sr=1-5>
Bill Bina
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