I have an external interrupt switch installed. I did not know they made a delay switch, I really got to catch up on this whole electronics thing. At first I thought the delay switch would be a great idea, but then I realized that if I open my doors after it sat a while, I would set the alarm off myself. The delay switch would work good for setting it but not for getting back in. When I get Rita back from the shop I'm going to be anxious to wire it up.