Brand new 2m long Playstation link cable.
These are sometimes referred to as 'VS'(versus) Link cables.

This cable allows you to connect 2 Playstations together to play head-to-head, on seperate TVs.
Will work with any game that supports link play.

These are for the original Playstation(the grey consoles) only, not PSone(small white console) or Playstation2.
Plugs into the socket labelled 'SERIAL I/O'

Nicely moulded cable, good quality.

Some games that support link play are:
Ridge Racer Revolution
Test Drive 4/5/Off Road
Formula 1
Destruction Derby
Andretti Racing
CART World Series
Wipeout/XL
Descent
Doom
Hexen
Command and Conquer: Red Alert
Dune 2000
Cool Boarders 2
Armored Core
............and lots more

I'm pretty sure all games will require a matching game disk in each Playstation.