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I have a few cameras around the house that were here before I bought the house. I believe I know which cables belong to them in the utility room, but I’ve plugged them into a DVR and there seems to be no signal. They are in places that are very high and hard to reach without a huge ladder, so this is the best shot I can get of them:

I had a roofer who was doing other work take a look and he said he couldn’t find a model number or anything on them. Anyone have a clue what these are so I can read the manual, etc.?