The DS1101i Detector uses microprocessor-based Sound Analysis Technology (SAT) to listen for the specific frequencies associated with breaking glass. The DS1101i can be used to detect breakage of plate, tempered, laminated and wired glass types. A built-in environmental test feature alerts the installer of false alarm hazards in harsh environments. A round cover design in available. Glassbreak detectors are intended only as a component of a perimeter protection system. They should always be used in conjunction with motion sensors.