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Posted (edited)

usually an alarm to check whether the walls (door/wondows-in a car) has been breached. As opposed to a "volume" alarm which checks whether anyone is inside the vehilcle - usually ultrasonic movement detectors.

 

I you have the volume sensing alarm there are perforated lobes at the to of the b-pillars with then ultrasonic transducers inside- - there are pictures on the site somewhere.

 

ah here it is

Edited by NikpV

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