You are looking at a TECHNICS X series remote control cables, control cables for black Technics X series separates.
Designed to be used between Technics amplifiers, tuners, CD players, EQ's, record players and cassette decks.
In the X series the Tuner acts as the remote and all the other separates connect using this cable therefore allowing remote control to the connected separate. You will need a suitable handheld remote control.
The cable measures 2 meters long enough so you can stack your system how you desire.
Please see my other auctions for all things Hi-Fi.
Thanks for looking.