Up for sale is a combo of Stello U3 USB Link and an Atlas Mavros SPDIF cable.  It allows you to link your computer (via USB) to a conventional DAC (via digital cable).

This beautiful little box is powered by your computer, or by a powered USB extender. It takes a USB cable, and outputs flawless digital through either a coaxial or an AES/EBU balanced cable. A driver for Windows is supplied, no driver is needed for Mac. You get full access to a range of resolutions, up to and including 24/192. Not compatible with Channel D's Pure Music or Sonic Studio's Amarra, but it sounds glorious with iTunes. Finally, computer audio is the state of the art!
 

the Atlas Mavros SPDIF cable is 1.5m long.

Both are in excellent condition.