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The AP450 series mirror optic PIR sensors use true curtain "barriers" to provide continuous floor-to-ceiling coverage for superior detection and undercrawl protection. The AP450 sensors use 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. These sensors are easy to install and include simple clip-on plastic mirror inserts for three possible coverage patterns. The optional SB01 swivel-mount kit mounts on a ceiling or wall.