This is the control unit that communicates with the camera and the network. The control unit needs network connectivity. As such, it usually resides in the back office close to where the network switches are.
Below is a picture of the camera out on the sales floor. It sits just above the entry threshold. The "camera" is not really a camera in the surveillance sense. It's a pair of lenses that are fixed. They are used to track motion and height.` Its main purpose is to count the number of potential customers that come in the door. It's a little tough to see, but it's that diamond-shaped white box on the ceiling with the two black dots (camera eyes).
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