Clive Arthur wrote:

Chris Green wrote:

I'm after a doorbell (preferably one which has two or more sounders)
which doesn't use batteries at all. I.e. both the button(s) and the
sounders are mains powered. I don't even mind all that much if wire
is required between the button(s) and the sounders but wireless would
be easier.

Are there any out there?

I have a good old "ding-ding" chime, with illuminated push button and CU
mounted transformer, don't know if there's an easy way to piggy-back
additional sounders off it though.

https://www.friedland.co.uk/en-GB/Chimes/Fixedchimes/Pages/D117.aspx

it's worth pointing out that the bell push batteries
last pretty much the battery shelf life in normal use as they're only
drained when the button is pushed.

How does that explain every battery powered one I ever try to use being
flat?