Finally I have a working solution for this. I've had 3 different audio cables that are supposed to take a TRRS and split it into a mic and a headphone plug. None of them have worked properly. This was plug and play, as it says. Windows recognized and installed the device within seconds. It is a Realtek audio adapter equivalent to what you'd find built in to most PCs. Works fine with both my iPhone headset (apple genuine old style) and my gaming headset. Totally rock solid and sounds great to me. Having a separate audio output I can control independently of my main speakers is actually a hidden bonus.
I have a mod mic 5 and was hoping to use this device to plug it in with, doesn't work. I can see microphone listed as a device in recording but no matter what you do it won't input any sound. Waste of money