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glass shock sensor Fully adjustable sensitivity Direct plug in for alarms with aux inputs Provides pre-entry protection by detecting the tampering and breaking of vehicle glass Provides extra security by listening for slight noises that your perimeter movement or shock/impact sensors may not pickup Highly sensitive microphone analyzes frequency, intensity and timing of intrusion sounds eliminating false alarms THREE WIRE HOOK - UP TO ALARM RED=+12 VDC, BLACK=GROUND, WHITE=NEGATIVE TRIGGER OUTPUT LED OUTPUT INDICATOR SIZE: 11 / 2" W X 21 / 2" D X 1" H COMPATIBLE WITH MOST ALARMS SOLID STATE OUTPUT SUPPLIES NEGATIVE TRIGGER EXTENDED MICROPHONE adjust nut turn clockwise. become sensitive(+) adjust nut turn counter-clockwise become less sensitive(-)