So on this particular wall in my apartment I have two fire detectors (one that's plugged in but seems to have some sort of internal battery and one that takes 9V batteries), a thermostat and... this:

enter image description here

Any idea as to what it is? Carbon Monoxide detector? Something else?

  • "But where is the button?"
    – Piotr Kula
    Commented Apr 5, 2013 at 14:33
  • 6
    Does it go ding dong? Commented Apr 8, 2013 at 18:38

1 Answer 1


It looks like a doorbell to me. Can't be sure though unless you pop off the case, which should come off fairly easily if you pull it straight out from the wall.

  • 1
    I vote doorbell also. I'll double down and say it's a Newtone. lol. Commented Apr 5, 2013 at 13:16
  • 1
    @shirlockhomes - Its NuTone
    – Freiheit
    Commented Apr 5, 2013 at 15:57
  • 2
    We don't do no fancy spelling here. We spell words likes they sounds! Commented Apr 5, 2013 at 17:36

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