Thanks guys, yes it is a low end unit. I am a bit surprised at how low end for a Samsung, I expected better. The pics are quite fuzzy even though the cameras have a CCD, it was what I made a point of finding out about first, but the pics are little better, if any, than a CMOS.
The box also has 4 x BNC camera connectors so I am guessing it will take better quality cameras. I might spring for one that points at the door from the inside.
I have a question or two of FPS etc but will start a new thread.
Nowhere near the sea and in fact, nothing rusts or corrodes out here in the 25% average humidity and 340+ days of sunshine.