"Our old wireless doorbell suffered from ghostly rings in the night - when there was noone at the door it sometimes sounded for no reason. Changing the frequency channel didn't help. Sometimes it also failed to ring when the button was pushed.
I got fed up with this, and was also concious that it was bathing my family constantly in low level microwave radiation. So I replaced it with this wired doorbell which has a nicer ring (a real bell rather than an electronic imitation) and is louder.
Overall it works well. The only thing I would say is that bell wire supplied with the unit is very thin, I used thicker stronger wire instead."
"Bought this to replace a wireless bell as it was intermittent. Installed it, fitted a brand new battery, pressed the bell........nothing! Tried a single piece of wire across terminals....nothing. Only worked once I took it back off the wall, tipped it forward and at a sideways angle and then it was still intermittent. Would I buy another one? Not a chance. In this case it really was 'buy cheap, buy twice'"