Wired Vibration Detector/Shock Sensor: ZDRV-971A Digital Vibratory Detector use the international advanced photoeletric sensor elements with CPU processing technology to ensure the rigorous monitoring for the protective coverage. Adjustable detective sensitivity in order to balance point correctly. It's applicable to Automatic Teller Machine(ATM) and wall /Glass / Strongbox etc. and provent any action of knock an ddestruction.