For getting headset to work this is what you have to do; you do not have to plug headphones and microphone into slots below, one connection to PC.

Installation of headset is as easy as plugging it into an existing USB port and putting them on head. Once the headset is attached, windows will detect it as a Logitech USB headset, and send Audio signals to the headset, the mic

This is where magic occurs; the audio signal is transformed and switched over to USB all in this small battery sized converter. This part is 1ft of cord closest to PC, perfect place to set this device.