Why do they make external noise?
So the person pressing the button knows it has recognized the button press
A little LED would do the job.
It might do that too? I've never looked.
I have an old school 12V chime wired into a transformer. You can hear that from outside and they presumably wanted to replicate that UI.
@RonnieOatmilk started
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So the person pressing the button knows it has recognized the button press