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The AP Series passive infrared sensors use true curtain "barriers," a feature that is unique to this advanced line of sensors. These infrared barriers provide continuous floor-to-ceiling coverage for superior detection and "undercrawl" protection. The AP Series sensors use patented 4D signal processing to evaluate an incoming signal's size, speed and shape. If the signal matches that generated by a human signature, the detector goes into alarm. This patented technology automatically adapts its alarm threshold when faced with a wide variety of environmental disturbances or harsh environments.