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spotter
It's going to be used with a Unifi G4 Doorbell Pro, so not quite a push button!
It will be powered by a 24w/24v transformer (overspecced to avoid the risk of voltage drop in cold weather) with a 24v relay (both DIN mounted) converting the G4's ring signal into the ding and the dong.
Doorbell will also be connected to the network with ethernet to avoid the potential of cold weather Wi-Fi issues which haunt the standard G4 somewhat.
This the result of considerable research and collaboration with @spotter !