New genuine long-term stock Kensington K72337/K72500 wired trackball mouse

Kensington K72337 Orbit Wired Trackball Mouse (Black) $330 Kensington K72500 Orbit Wired Trackball Mouse (White) $390 - Trackball mouse with scroll ring (40mm) - Thumb ball type, comfortable rolling for both left and right hands - No need to move the mouse with your arm, occupies minimal desktop space - Control the cursor by moving the trackball, the scroll ring design allows faster vertical web browsing without clicking - USB connection - Removable wrist rest - Customizable dual-button design via TrackballWorks software - Operating Systems: Windows 7, Windows 8, Windows 8.1, macOS 10.8, Windows 10, macOS