This document summarizes the features of a wall-mounted passive infrared sensor system. It has an original quad element pyroelectric sensor coupled with fuzzy logic for high sensitivity and catchability. It uses precise mirror optics and an easy aiming system to ensure high sensitivity and reliability. The system monitors for troubles and will trigger an alarm if issues like a circuit problem, low voltage, or unreplaced head unit are detected. It can be adjusted between quad and twin element sensing and has options for alarm LED, contact configuration, and sensitivity level adjustment. The system also contains an alarm memory and allows remote LED control from a control panel.