Panasonic BL-C1A - Manual (Page 84)

Operating Instructions
84
Note
No responsibility will be taken by our company with respect to consequences
resulting from the use of the Motion Detection feature. The Motion Detection
feature is not suitable and not recommended for uses that require a high
reliability constantly such as surveillance, etc.
What is the threshold?
The threshold is the minimum value for the camera to detect motions on the image
during the motion detection buffering. Setting the threshold lower allows subtler
changes to be detected. Setting the threshold higher allows only bigger changes
that might occupy half the image to be detected.
Threshold