The Viewguard PIR detectors are motion detectors using passive infrared technology. To ensure optimum detection, detectors are equipped with high-quality mirror optics. Standard equipment includes a mirror area for optics. If required, the detectors can be retro-fitted to long-range or curtain optics with accessories that are available separately. The detectors are suitable for intruder alarm panels with conventional technology and are available with or without Anit-Mask function (monitoring against covering).