only glass break ?? Hmmm ...... i thought it was a ultrasoon sensor. i try the key thing.
buf further the new oem alarm works great. and it took only 1 hour to instal.
To do ultrasonic, there'd need to be an audio speaker, and it'd need to be where it could send and receive a large audio "footprint".
It works by sensing a change in audio return.
They explain it very well in an episode of Mythbusters.
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