6 PAIRS (12 Pcs) Mini CCTV BNC Video Balun

These are perfectly competent video baluns, and honestly described in the product description.

However, all purchasers of such items should be aware that while such inexpensive passive baluns will provide the desired impedance matching and common-mode rejection, they do NOT provide any sort of isolation at all -they are wired in an autotransformer configuration.

As a result, they provide ZERO protection for the video ports on your camera/DVR/whatever.

You can see this yourself without gutting one by simply using an ohm-meter to measure the resistance from the balanced line terminals to the BNC terminal -you will discover that one of the BL terminals is directly connected to one of the BNC terminals, and the other has a very low resistance between it and the other BNC terminal.

Or you can go to the Wikipedia article for BALUN and see a schematic of a typical balun, right under the subtitle: "Types of balun"

If you are running video over twisted pair, I sincerely recommend using some sort of grounded lightning/surge protection device between the BALUN and your more expensive widgets, like a DVR. The newer, inexpensive security DVRs do not seem to have much in the way of internal protection on them, and a nearby lightning strike or whatnot can easily generate voltages on the twisted pair that will fry an input port. Cameras seem to be more durable.

Bought this item to test it out and, it works ok for the price I paid for.

just make sure not to move the balun from DVR once you get it to work

otherwise it will loose signal.

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Items work as promised. However they are cheap. The spring on the locking ring is weak and the fitting is loose. If you wiggle or bump them the video goes OUT or becomes noisy. This is a pain if you put the balun into the camera housing and later have to disassemble the camera again to wiggle the balun. If I had to do over, I would buy better quality baluns. The size is good and the fact that there isn't a cable hanging of them is also a plus to me. However they do work as long as you dont touch or wiggle them.

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These units were priced to sell. They do what a Balun is supposed to do. Match a Balanced signal to an un-balanced connection. Balun.. Balanced to Unbalanced.

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These baluns work flawlessly. Just as good as any other $10/a pair passive balun at a fraction of the cost.