Python car security system goes off when a truck goes past it?

CoolDude

New member
I have a python 474P ar security system that I got installed from Circuit city 2 years back. I don't have the specs nor the knowledge on how it works. The problem I am facing is that the alarm goes off whenever a truck like a garbage Tuck goes by it. I am trying to adjust the sensor but do not know where it is located and how it looks like. Any advise please?
 
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