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I just noticed this thingy on the wall of my apartment. Weird I haven't paid any attention to it since I bought this place. I could swear I just heard a low-pitched sound coming out of it. Is it a speaker? If so, where could the sound have come from?

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    Are you in a large apartment building that might have modern fire alarms? Larger buildings should have some way of alarming from a central alarm (as opposed to the little standalone models), and it's possible that is part of that system.
    – Joe
    Feb 16, 2018 at 20:27
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    i hate hearing the listeners too; ruins the illusion of privacy. just kidding. it could be alarm, doorbell, or just covering up a cheap contractor's "oops" in the drywall.
    – dandavis
    Feb 16, 2018 at 20:29
  • @Joe Yup, I am in a tower with 30+ stories. A central alarm makes sense. That must be it.
    – Eddie Kal
    Feb 16, 2018 at 20:34

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If you're in a large apartment building, it may be a fire alarm or a speaker for the doorbell system (functional or no longer functional if they've switched to a cell phone based system). Those are very common in larger buildings that are required to have a central alarm instead of only unit-by-unit alarms.

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