1-channel presence detector with two simultaneously operating relay outputs, allowing for distribution across different phases. The switching channel with the two relay outputs closes in the event of a power failure of the detector, ensuring that the lighting remains on as long as both phases of the lights are powered. The device requires a power supply. The third phase can be utilized for this purpose. Specifically designed for corridors, it can function as a master device, with the possibility of extending the detection range using slave devices. Manual switching is possible via a button. Additional functions can be set using an optional remote control. Markings are provided for the alignment of the detector.