They seem to be cropping up everywhere, and yet, none of them ever seem to work, at least on my round.
Because of this, whenever I press a doorbell (regardless of if it is wireless or not) I always listen for a sound, and if there is none, I knock, just to be sure.
It can be a bit of a pain, especially if you have a packet for them. Who else has noticed this, and what do you do?