Siemens motion switch delta 120 ap white anthracite ip55 siemens 5tc7211 the siemens 5tc7212 delta 120deg is a surface mount reflex motion detector that will detect any movement within its range it will automatically activate and deactivate an electrical device which is connected to it for example a light or an alarm in addition a red led integrated in the sensor indicates by flashing when a motion is detected the motion detector has a 120deg detection radius and can be wall or c