This USB to headphone jack includes a stereo headphone output jack and a mono microphone input jack. It can bypass the defective sound card or the faulty 3.5mm audio port of your laptop/desktop system and regain the audio function for you. Save the cost of replacing a failed sound card. When in use you may need an audio cable, we considerately add two audio cables (20cm & 100cm) in this pack. Take a suitable one to use anytime when there's a need. If for any reasons you are not satisfied with our product or service, please feel free to contact us first, we will answer and solve it asap to meet your 100% satisfactory with best service.