Get it by Saturday August 26th by choosing the expedited option during checkout.
Large ball Trackball Mouse with Scroll Ring for comfort and precision
Customizable 4-Button design via TrackballWorks software
Compatibility: Chrome OS 44 and above, Mac OS 10.8, Mac OS 10.9, Mac OS Sierra 10.12, Mac OS X 10.10, Mac OS X 10.11, Windows 10, Windows 7, Windows 8, Windows 8.1
Kensington Expert Mouse 64325 Trackball