Old, wired doorbell quit.through process of elimination it turned out to be the 24V transformer mounted in the attic. At 72, I did not relish crawling into the hot, low clearance attic. This alternative was much easier and less expensive, time consuming. and hard on an old man's muscles back and knees.Including reading all the directions and 'pairing the button to the receivers, it installed in less than a half hour, It sounds and works GREAT !
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