Some of the transformers (as was my case) don't provide enough current (not voltage) to power the doorbell IF YOU ALSO WANT TO KEEP YOUR ORIGINAL OLD MECHANICAL CHIME which I did. I had to replace my transformer which was in the attic with a higher current version because sometimes the mechanical chime worked and sometimes it didn't until I changed the xformer. My home is 14yrs old so YMMV.
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"I think the scariest person in the world is the person with no sense of humor."
Michael J. Fox
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