Steinel Ultrasonic Sensor (US), Dual USTechnical Details: Datasheet Watches over the entire corridor. And can see around corners. Dual US ultrasonic motion detector, ideal for corridors and passageways. Reliable detection within 20 m, envelops objects as opposed to penetrating them, detection regardless of temperature, electronically adjustable reach, COM1 for switching light ON and OFF. COM2 for switching light ON and OFF and also for operating HVAC. With 5 Years Manufacturer's Warranty