This is an Audio Cable for the original Mockingboard and Phasor Sound Cards. It has dual Male RCA plugs to a Female 3.5mm Outlet Jack. Using this the Cable you can attach standard PC Speakers or Headphones directly to your Sound Card.
Cable is 3 inches long.
Note: 3.5mm Outlet Jack is the size most common for Walkman-type Headphones and PC computer Speakers.