What motion detector are you using?
It is a driveway monitor. Got it from Radio Shack but the model looks to have been discontinued. It has been in use 24/7/365 for over 2-1/2 years now and is still working(knock on wood). Distance I am working with is 750 feet.
On edit: It is this one.
https://www.amazon.com/Chamberlain-Wirel...riveway+monitor