Infrared motion detectors (also called PIR motion detectors) react to changes in the ambient temperature, e.g. due to the movement of a person in the detection range. At very high ambient temperatures, e.g. in summer, the distance is reduced because the difference between the ambient temperature and the temperature of the human body is only very small. This makes it more difficult for the motion detector to detect movement. The specified maximum distance applies to optimal conditions at a temperature of 20°C and without wind. Other factors such as the installation height or the orientation of the motion detector can also play a role. Infrared motion detectors always detect movements across the device better than movements directly towards the product. For optimal function, please be sure to follow all installation instructions in the manual.