Some time ago I replaced the old door bell of an elderly relative who is going a bit deaf. I got a wireless system with two chime units, one battery one mains, which could be placed in different parts of the house. When it worked this arrangement was much better, but the reliability has been terrible.
I've had to fix it 4 times in the last couple of months. Sometimes the rubber push has been pushed in too hard (I guess) so it has got misaligned with the microswitch, once this made the push stay on until the battery ran down; sometimes it's not obvious what's wrong, it just doesn't work until I take it the push apart, reassemble, and resynchronise the remote units. At least once the chimes have gone off when there has been nobody there - radio interference I'd guess, or maybe a mains spike. When I tested it yesterday, it wasn't even reliable when the bell-push transmitter was just a foot away from one of the receivers - sometimes worked, sometimes didn't, even though the green LED on the bell-push went on each time.
It's obviously crap, and indeed I think the whole concept of wireless bell pushes is flawed without better quality units. Unfortunately all the units I can see in the shops are made by the same company, Byron, which I will obviously never buy again. I'd like to take the current unit back and demand a refund from the retailer, but after more than a year I guess it's too late.
The old transformer is still there but not plugged in, and much of the old wiring too, so I suppose I can just connect another bell or two, if I can find ones that take the same voltage (6 or 12 volts AC as far as I remember). But I need at least one new loud bell unit, and a new bell-push for the door. Any recommendations?