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The AP475 mirror optic PIR sensor uses a true curtain "barrier" to provide continuous floor-to-ceiling coverage for superior detection and undercrawl protection. The AP475 provides a single 75-foot (23 m) curtain and can be installed up to 16 feet (5 m) high. The sensor uses patented 4D signal processing technology to evaluate whether the size, speed, shape, and duration of an incoming signal match that generated by a human. This technology automatically adapts its alarm threshold when faced with environmental disturbances for fewer false alarms.The optional SB01 swivel-mount kit mounts on a ceiling or wall.