Methodology
How the Carbon Monoxide Alarm Finder works
We compare published specifications; we have not tested these products.
Which details affect a match?
A model matches when its details meet every choice you select. Missing or conflicting values stay unknown. If nothing fits, the finder shows the closest option and what it misses.
- Which power source works for your intended location?
- Do you want a replaceable battery?
- Which connection mode are you comparing?
Order and links
The starting order helps you browse. Your choices determine which models match. When the first match has no product link, the finder identifies another linked match separately. Commission amounts do not determine a match.
Sources and limitations
Ten CO-only models from two manufacturers are compared; smoke/CO combinations belong in the separate smoke-alarm finder. All selected models list electrochemical sensing. Eight X-Sense connection modes are supported; the two First Alert connection fields remain unknown. US SKU identities were checked and European-only specification pages were excluded. Sources checked September 26, 2026. This comparison uses published manufacturer specifications; we have not physically tested these products. Unknown values mean “not listed by the maker.”
The finder shows source links and the dates they were checked. Those dates do not establish today’s price or stock. Before ordering, confirm the model and variant on the seller’s page.
View the product sources