Amazon.com: AbleNet BIGtrack 2.0 Trackball Mouse - New and Improved Version 2.0 Switch Enabled and USB Wired Part 12000006 (Switch is not included) (Renewed) : Electronics
Cruise around the computer screen with the BIGTrack TrackBall Mouse - YouTube
AbleNet 10000039 BIGtrack Wireless User Guide - Manuals+