The only way to know your smoke alarm is functioning and ready (except for letting your turkey burn in the oven) is to test it. And tests don't just confirm that smoke detectors have power -- they ...

Test smoke detectors monthly by pressing their “test” buttons – if the alarm sounds, everything’s working fine. If you’d prefer extra reassurance, test your alarms with actual smoke.

Test and check carbon monoxide detectors, too. In fact, use the occasion to do a full-house safety check — alarm systems, video doorbells, radon mitigation systems … you get the idea.