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Step 1 of 4

First: what does it sound like?

Tap the one that matches what you hear.

A single chirp every so often

Every 30–60 seconds, or a few in a row each minute

Non-stop beeping, or groups of beeps every few seconds

Possible smoke or CO. Get outside, then call 911.

Not sure which? If it could be an alarm, get everyone outside first.