PERIDECT ® Perimeter detection system is intended for securing of fenced properties. It reliably detects and exactly locates attempts to breach the perimeter (fence) by climbing over or under, cutting etc. The system PERIDECT ® using unique function of differential logic, demonstrably achieve (in comparison to other perimeter protection systems) a significant reduction in the incidence of false alarms due to weather (e.g. wind, storms, hail, lightning)by means of unique function of differential logic.