Bus dual detector for room monitoring for very reliable detection of movement using passive infrared and microwave technology. The two-stage sensor detection, in which the microwave sensor must confirm a detected movement by the PIR sensor, reliably reports a movement to the System 9000. PIR detection range: 12m x 110° (can be optimized using optionally available interchangeable lenses, e.g. curtain or small animal immune lenses), MW detection: 1-15m adjustable and 24-90° depending on room conditions. Recommended installation in the corner of the room at a height of 2.5m. Occupies one address in the System 9000. Including tamper protection. Operating voltage via bus, quiescent current consumption: 5mA, I-calc =25mA. Operating temperature: -10°C to +40°C. Dimensions: 60 x 110 x 52mm.