FYI, there are two types of glass breakage
sensors. One type detects the sound of
breaking glass. The other detects the
vibration of the glass breaking on the
surface it is attached and then the
contacts open and close in conjunction with
the vibrations. The sound type supposedly
can do a given area whereas the vibration
type must be on each window. On my windows
if I put a sensor on the stationary window,
then the movable window will not go past
it. Just food for thought