Microwave motion sensors are active motion detectors - the integrated measuring element sends electromagnetic high-frequency waves (5.8 GHz) and receives their echo. The sensor detects changes in the echo caused by even the slightest movement in the observed area. The devices are characterized by high operating frequency, low power emission (< 10 mW) and very good motion detection towards or away from the motion sensor. The MCR-01 is a microwave motion sensor, intended for installation in lighting fixtures, behind walls and other obstacles made of drywall, glass, wood, plastic, etc. In the case of such installation, the motion sensor is not visible to people moving around the area which the sensor monitors. This solution increases security in rooms - the sensor is inaccessible to intruders and turns on the light automatically.