Shock and vibration detector via unidirectional radio, frequency 868Mhz. Range 6 meters. 24-hour perimeter protection detector designed for indoor applications. Utilizes its ability to analyze vibrations, detects entry attempts when there is an attempt to force, break, drill, or see through the protected window, door, wall, or ceiling. Compatible with RISCO™ 1-way and 2-way wireless systems.