Shock and vibration detector with magnetic contact via unidirectional radio, frequency 868Mhz. The Knock and Vibration Detector with Wireless Magnetic Contact combines a shock detector and a magnetic door / window contact detector in a single device for indoor applications. The detector uses an advanced digital microprocessor to analyze the vibration signal received from the piezoelectric sensor. It also includes a magnetic contact for protection against the opening of doors and windows and against any attempt to sabotage the detector using powerful magnets. CR123 3V lithium battery included. Compatible with RISCO™ unidirectional and bidirectional wireless systems.