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Thank you thats very helpful as you can probably tell I am finding this very interesting and fascinating its just amazing how alarms work like I said thanks (again)

Just another quick question what ar the white boxes that have 9505 written on them? As I have 3 and I know that they are part of the alarm its still working excellent and has a new battey . thanks in advance :D

I'm back I found the manual for it and it is a scantronic 9500 multiplexed electronic intruder alarm system and it seems to be very complicated there is also white boxes around the house that are connected to it this is the one I was talking about this is a newer one I think altogether...

Hey I would like to know what alarm I have in my house the box in the utility room is large and black with white lines across it and a blue lcd screen and has 9500 written on it, next to the front door there is a smaller keypad which is has a white surround with a grey bit around the numbers...