This little block provides a hard point to mount two mini (3.5mm) headphone extension cables to your desk as if they are jacks.

Simply slide the female ends into the tapered openings (pass the wires through the slots) until the cable housings is tightly held. Then using an adhesive tape such as 3M Command strips, bond the housing slot side down to your desk.

The extension cables I used came from Best Buy, but would expect most cables to work.