I need to research and order a door bell for a sort of portakabin.
I am not sure that we will be allowed to drill holes through the wall itself (we can screw the bell push to the frame outside, and the bell-unit on the inside, tho).
Can you get properly wireless ones? Are they any good? The portakabin is fairly substantial, but the bell push and the bell-unit will be no more than 2' apart, I'd say, with the wall in between.
TIA