This is a single joystick converter for the Commodore C16 / Commodore Plus 4 
 
This 2 in -1 Cable combination converts port 1 or 2 to Atari / C64 / Amiga standard with a 1.5 metre extension 
 
the converter will allow you to use a better array of joysticks like the wico joysticks,
competition pro and the even better zipstick