If the target size is too large, the camera may not trigger for anything less than an object the size of a car. Higher sensitivity means a smaller change in the video is needed to trigger a clip, but ...If the target size is too large, the camera may not trigger for anything less than an object the size of a car. Higher sensitivity means a smaller change in the video is needed to trigger a clip, but if the sensitivity is too high, the camera may trigger constantly. Note: For camera models ADC-V521IR, ADC-V522IR, and ADC-V722W, the sensitivity setting affects all Video Motion Detection (VMD) windows for the specific device.