Logitech Cordless TrackMan Software for Windows, macOS -
Logitech Cordless TrackMan FX Optical Mouse in Very-Good Condition | eBay
Trackballs that I have known and loved: A history in hardware | ZDNet
A size comparison between the Logitech Cordless Trackman Optical, the Microsoft Trackball Optical, and the Elecom Huge, for if anyone is curious. : r/Trackballs