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Alright, here's what I know about these camera's.
They run on a modified recorder in the way that it records. They can set the cameras to record in time-lapse, so with a standard vhs tape, which some systems don't take, instead of 6 hours, they can cover like 14. Now, with at least the store I worked at, the system was old. But it recorded people relatively well. Enough so that you could make out their faces and defining features on each of the 3 cameras we had. I do not believe we had a standard VHS tape.
Also, if I remember correctly, in one of my classes someone did a feasability study for a park on equipment like this and they found digital equpiment which would get them decent quality would be at least $25k with the cameras, servers, wiring, installation etc. And then you need to be able to devote a portion of the building off to said closet and the power was quite a bit. The dummy cameras are about 20 bucks with minimal power usage so sadly sometimes that's where some companies go.
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