The AJAX MotionProtect Plus motion detector is virtually the same as regular MotionProtect, but with one difference.

An additional microwave sensor (Radar) can filter out interference from the air conditioner, open windows and curtain movements. As soon as the standard infrared sensor detects a movement, this additional sensor switches on. If it detects an identical movement pattern of real people, an alarm signal will only be generated. This makes the chance of a false alarm even smaller than with the standard MotionProtect, because air currents with temperature differences do not affect this detector.

AJAX MotionProtect | AJAX Alarm System
MotionProtect Plus