Well I only used 2 of the 6 so far an I worked one failure out of box this is the first time I used this model with audio attached have had great luck using the model with power an bnc only part # 6878 but for the money I haven’t lost any thing I get 25-30$ each set
We use these to repair existing analog camera installations. They come in handy when you need them because Cat5 is easier to run and terminate than Coax cable. Be careful that you do not use cheap Cat5 cable however because it will really shorten the distance you can run these. Another nice feature is they carry audio so you can slap a high gain mike on a few cameras in your CCTV setup. We have used these for years here and there. The Monoprice branded one are pretty much the same as the other brands we have used. They sure look the same only different label. What can I say, they work, the quality of your picture is going to be determined by, first your camera, second the distance from the NVR and the quality of the wires and or connection. So far the dozen or so we used from Mono have worked just fine. We weren't doing 4K cameras, just little old 1080p 2mp cameras and we couldn't tell the difference from the analog ones.
I have installed 50+ of these, they just work. These are different from others you can buy. These have a filtering circuit that cleans up a lot of noise and ground loop issues.. The ones you can buy that have two screws for the cat 5 are not filtered.
These baluns don't require CAT5 wires. I'm using spare pairs on an inter-building 25 pair key cable which are CAT3 at best. For longer runs, I put a local 12v power supply closer to the camera and just use one pair for video back to the DVR.
The pairs used are documented on the balun package and use T568B wiring.
PROS: Allows me to use my telephone copper twisted pair infrastructure and not have to run any new wires.
Very low price.
No noticeable signal degradation.
CONS: The BNC male connector is fixed to the balun housing. This makes tucking the balun/connector mass into the camera mounting box a little tricky sometimes, but the whole package is small enough to fit into a standard single-gang J-box.