I have no idea what this is for, but I can tell you that I have a Panasonic MiniDV camcorder with a 3.5mm TRRS AV out and did NOT transmit the signal correctly. I believe the three wires are connected to the wrong parts of the 1/8" connector and I couldn't get a video signal from it. I've tried connecting all 3 RCA cables to my TV's video input but nothing. Tried a different cable with the camcorder and the picture was fine so I know it's not a problem with the camera or TV. Too bad this type of connector has never been properly standardized. Enjoy the trial and error process to get the right configuration for your device.
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