Perhaps the weakest point a passive infrared detectors outside use - their fragile work and a large number false positives due to constant changes in temperature and strong visible light. Optex Technologies can successfully cope with these problems, which causes detectors Optex popularity among users. The principle of passive infrared detectors based on the identification temperature difference between the object detection and background environment environment in the lower spectrum of infrared radiation. If this difference is large (people against low temperature environment), it is also large and change energy. In this case, the alarming signal is generated at high change in energy. Contrary, with little difference temperatures (a man in a dense clothing and fever environment in the hottest time of year) must generate alarm a small change in energy. Therefore the main task of detectors - to change the threshold of generation of anxiety, depending on the ambient temperature and the temperature, size, speed and direction of motion of the object detection. The unique optical system consisting of a set of mirrors and refractive lenses, provides a precise focus on the pyroelectric element, creating a uniformly distributed throughout the zone of sensitivity of detection. Detectors LRP series ideal for CCTV systems as a motion detector to activate lights, sirens and other means of alarm. Detectors series LRP safely protected from external factors that lead to undesirable triggering of the alarm relays. The metal shell protects from temperature extremes and mechanical effects, and improved sealing system creates a unique environment for the pyroelectric elements.