Itac Mouse-Trak Trackball Roller Mouse, Early Computer Vintage 1980s Collectible.

This item is in excellent used condition. 

The track ball spins very smoothly, although it is noisey. (It's made that way)

The buttons all click very healthily. 

The body is slightly yellowed from age.

The wrist rest has an indent from use.

7 pin mini-din connection type. This is not ps2