Microsoft Trackball Optical 1.0 PS2/USB Compatible Missing Trackball PARTS ONLY | eBay
Microsoft Trackball Optical 1.0 Ergonomic Mouse X05-87475 | eBay
Microsoft Trackball Optical - Trackball Mouse Reviews
A size comparison between the Logitech Cordless Trackman Optical, the Microsoft Trackball Optical, and the Elecom Huge, for if anyone is curious. : r/Trackballs
Looking for drivers for Microsoft Trackball Optical on Windows 11 - Microsoft Community