AQUARIUS MINI EXPANDER for Home Computer System  SUPER RARE Mattel Electronics

As you can see from the photos,  the previous owner has made some modifications including adding an extra connector visible in the photos.

I have listed this as spares or repair as I do not have a working machine to test it with. It is also forty years out of warranty!

Original Mattel item.

SUPER RARE OFFICIAL PERIPHERAL for the Mattel Aquarius computer, which adds extra ports, two more sound channels. 

The original box would have contained, two, detachable controllers, but all I have, and am offering, in the AQUARIUS MINI EXPANDER.