Mirror Optic PIR, 9 curtain, 40 ft. range, Pet Immune, UL/ULC.Aritech Mirror Optic PIR Motion Sensors offer a unique combination of high sensitivity detection and low false alarm rates, without the need for manual sensitivity adjustment. Equipped with advanced and sophisticated mirror optics technology, Aritech EV series motion detectors use a unique step and gliding focus feature to create a continuous curtain that ensures sensors never lose track of objects. For increased detection coverage, these sensors have also been optimized using a 3Brid orthogonal curtain. A horizontal mirror structure producing curtains with vertical orientation, this orthogonal technology adds curtains to the mirror without sacrificing signal strength, and without having to increase the size of the sensor. With "5D" signal processing, EV series motion detectors have built-in intelligence capable of differentiating between fast and slow moving signals. When a slow thermal source is detected, the signal processing switches automatically to the 5D mode and executes additional pattern recognition to identify the signal. Using “5D” signal processing EV series motion detectors can differentiate between a slow walking person and a moving reflection of sunlight, enhancing security while reducing false alarms. Versatile and easy to install, these sensors are tolerant of wall angle deviation and can be mounted at heights ranging from 6 to 10 feet.