Car Alarms: alarm, siren sound, resident technicians

Question
I have a autopage rf-220. It seems to sound off a quick siren sound every hour or so with no one around the car. Can you explain this?

Answer
Away for the Holidays!
But the forum is still open.

Please, if you would, restate this question
in my installers forum at www.installsupport.com
and see if my resident technicians there can assist
with this project. (ask for Robert!)

He can go into a more detailed assistance
you might need on this project.

Good luck there,
and Merry Christmas!

Robert Martin
ALARMTEK
CARALARMMAN.COM