The range of XD is determined by the combined range of the three detection technologies it uses – two PIR sensors and one microwave detector. For best performance in outdoor conditions the Tri Detection range is specified between 10m to 13m depending on the lens fitted to the PIR detectors. 2.4m Installation Mode (Lens 5, 10m range): In this mode the detector is installed at height of 2.4m providing volumetric coverage of the area and animal immunity of up to 10kg. This is the factory default configuration where the detector is fitted with Lens 5. 1.5m Installation Mode (Lens 3, 13m range): In this mode the detector is installed at an height of 1.5m providing horizontal curtain coverage of the area and animal immunity of up to 25kg. This is an alternative configuration where the detector is fitted with the supplied Lens 3.