This Sabrent AU-MMSA 2.1 Audio Sound Card Adapter is a highly flexible audio interface, which can be used with either laptop or desktop system. It requires no drivers, instant audio playing and compliant with all mainstream operation systems like Windows and Mac OS. It's a plug-and-play device, simply plug the Sound Adapter into your USB port, and then plug your headphones into the Adapter.
You may need this external sound adapter in cases when your USB port is more accessible then the audio and microphone jacks, or they are have a poor quality. Also, it's a great solution for your PC when your regular audio jack is broken, unavailable or you have no microphone jack.