The Optex HX80 is a high mount, wired, outdoor passive infrared detector with Anti-Masking that provides the stability and reliability necessary for an outdoor PIR sensor. The exclusive pyro element on board enables this detector to project an ideal detection pattern, thus allowing for more accurate detection of humans and less false alarms. It has anti masking technology which enables it to detect when the lens is being covered by intruders thereby sounding the alarm. In addition, the HX-80 has a dual detection pattern technology where upper and lower detection areas have to be activated in order to generate an alarm condition. This technology helps to prevent false alarms caused by a pet or small animal. Its detection length can be limited to avoid unwanted detection, and its short range zones can be masked if needed. By limiting the detection range, false alarms due to unwanted movement (cars, persons or animals outside the protected area) can be eliminated.