Summary Needed a doorbell replaced. So one button for Family one for the kids and one for postal delivery. but you can use them for what ever you need. each one rings a different door bell. great for when kids come calling. I don't have to leave my projects just to answer the door :) to tell the kids its for them.... Ill do a part 2 ( internal bell housing if needed )... The buttons are from Ebay and are waterproof stainless steel .. about $4.00 each.... the LED plate is if you want a night light behind the names ( 2 x 3mm LED )and also will highlight the name for the button pressed (3 x 5mm LED's) " Remove the middle name plate to screw the unit to the wall " have included an updated LED plate with light baffles