The lighting in long corridors, hallways, and passageways can be switched with the utmost precision, as all objects can be distinctly recognized. For the Dual US, this is no problem thanks to ultrasonic technology. Mounted at a height of 2.5 to 3.5 meters, the presence detector detects even the smallest movements—regardless of their direction—within a detection angle of 3x20 meters. The sensor reliably ignores individuals in adjacent rooms, making it the perfect corridor sensor for office and administrative buildings.