I'm very curious what this Thing in one of my closets is, and why it's in a locked case

maybe related to the heating system? the thermostat is a typical cheap basic one, and pulling the thermostat off the wall it looks like the same size and color of wires. when the heat kicks on and off, the radiators make a sound like a small motor, so maybe a relay for those?

@alex the buzzer is a modern system with video, and the building is new so it wouldn't be a leftover from a previous system

@nat I don't think so, the building is new and has a video buzzer system

@else Sounds like good sleuthing. My usual approach is unplug it and see what breaks.

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