Fredxx wrote:
The OP has a wireless door bell. The push button would comprise a
battery, switch and transmitter. So no easy means of detecting the
switch closing.

Ah sorry, I missed 'wireless' in the OP.

I have thought about this and can't really see any alternative other
than get a doorbell and purchase more than one sounder of the same make
and type. If you choose the same channel one push button should be able
to transmit to a dozen or more sounders. If you choose a respectable
make there might also be visual indicators too.

Indeed, it would seem simpler to pair another sounder with the push button.
And if the system isn't capable of doing that, to purchase one that is.
It's not like wireless doorbells are expensive or rely on pre-existing
infrastructure.

Theo