How Does Video Get Into Dahua HD Portable Video Recorder?

I'm puzzled by Dahua's MPT300 HD Portable Video Recorder. How does video get from the camera into the recorder and what kind of cameras can be used, e.g. IP, HDCVI or analog? I've read the specs but am none the wiser. It looks like it is only designed to record from a single camera. Can anyone else work it out?

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