In article ,
wrote:
Only weakness is IP44 rated door switch which is OK in a sheltered
spot but would be useless where I live with penetrating rain and snow.

In a lot of houses, people often fail to hear piezos. They'd be far from
reliable here. Yours may be different.

It will obviously depend on the house design and if say you tend to have a
radio on etc all day.

I have two underdome bells driven from a transformer. Can be heard all
over the house easily - and also from the front door when you ring the
bell. Which gives a visitor the reassurance it is working.

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*Husbands should come with instructions

Dave Plowman London SW
To e-mail, change noise into sound.