The Koss USB Dongle serves as an adapter for your multimedia headset. This unit combines the microphone jack and the headset jack into one convenient unit that utilizes any USB port, so you can stay connected to your computer while communicating with your mic headset. Plug your headset plug and your microphone plug into the Koss USB Dongle. Plug the USB Dongle into any USB port and connect with the Sound of Koss.