DVR’s detect motion by looking at the video pixels (little light and dark dots that make up the video picture). As the pixels change the DVR sees motion. DVR’s have a “Mask” or over lay for each camera, the screen is divided up into many small boxes called cells. Each cell can be individually turned on or off to enable or disable motion detection in that cell. This allows a camera not to see normally moving objects such as tress or fans. Each camera also has a sensitivity level setting, this controls the amount of change in motion before the systems triggers. All motion sensing is done in the DVR. The camera has nothing to do with motion sensing it just provides the video to the DVR because of this. Almost any camera will work with our DVR’s.