I have a normal doorbell.
I'd like to replace it with something that rings a bell and allows for
communication with the door closed.
Does an intercom typically require more wiring than a doorbell?
As long as there is power, shouldn't you be able to install something
the broadcasts wirelessly to a receiver inside?
IIt's possible such a thing could exist. Did you try googling
for wireless intercoms? Also, if you allow for battery operation,
then for sure it's possible.
Sure, lots of them show up on line including one with a 4-mile range! (in
case you have a long driveway, I suppose) There are models with video too.
Also, search "wireless doorbells". Some of them come with intercoms.
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