Your absolutely right steven r! But this is the information age... what they (ADT) are also selling is (Information) Technology. They come to your home.. setup the system... guarantee all the wires are connected properly.... and show you what buttons to push....
Good point.
For what it's worth, the local company that installed my alarm did also. They also went over the setup and operation with me. In fact, when I told them I wanted an output to trigger my powerflash, they found the proper output and ran wires over to the powerflash at no additional charge.
Had I gone with a company like ADT, I would of paid for for my system several times over by now. Furthermore, many "big name" companies install special equipment that lock out any chance of switching to any other monitoring service. I consider that to be like blackmail.