The Viewguard DUAL motion detectors comprise two independent sensor systems: a passive infrared detector and a microwave sensor. The functioning principle of the detector is based on an intelligent coupling of the two sensor systems. This coupling renders the detectors particularly insensitive to air and thermal turbulences. Viewguard’s distinguishing features are optimum alarm detection and extremely high false alarm security. To ensure optimum detection, detectors are equipped with high-quality mirror optics (area optics). The detectors are suitable for intruder alarm panels with conventional connection technology and are available with or without Anti-Mask function (monitoring against covering). Range 8-15 m.