New Dual Technology Wall Switch Sensors give you the most sensitive and consistent way to manage lighting energy consumption. They do it through dual technology design that combines both passive infrared (PIR) and ultrasonic technologies. This combination gives you two ways to detect occupancy and turn lights on and off automatically. PIR technology detects the infrared energy from a human body in motion, and ultrasonic technology spreads coverage over a wider area and detects smaller movements to time the ON/OFF function more efficiently. Dual Technology Wall Switch Sensors are ideal for a wide variety of commercial applications, from small offices and executive suites to conference rooms and break rooms.