You are looking at a TECHNICS X Series control cable for Technics X-series audio separates.

Designed to be connected between all X-series components, Tuner, CD player, Cassette deck, Amplifier, Equaliser so all items can be controlled from one remote control.

Each component will need one of these leads. 

The cable measures 90 centimetres long enough so you can stack your separates next to each other or on a separate shelf in your rack.