The Japanese manufacture Optex was founded in 1979 and is now becoming a world-leading company In the area of security detectors with its unique Infrared detectlon technology.(security manufacturer,security,sensor,security sensor,outdoor,indoor,outdoor sensor,indoor sensor,detector)

Both quad beam and twin beam employ multiple beams and use an "AND" circuit that requires all beams to be interrupted simultaneously before an alarm is generated. This reduces false alarms due to accidental beam interruption by falling leaves, small animals and so on. Since the reliability of the optics is determined by design of the optics, it should be designed for the most appropriate shape to detect only human intruder. The length between upper and lower optics, and the width of the optics, these design considerably relate to the protection of the false alarm. The number of the IR beams in irrelevant.