X-Keys O-Trac Opto-Mechanical Trackballs X-keys O-Trac Beige Trackball (TKB-6001-PBGBG-R) $100.00 Quantity: Part Number: TKB-6001-PBGBG-R Compatibility: Windows XP through 10, Mac OS 9 and later and most versions of Linux Beige Opto-Mechanical Trackball with beige colored buttons and globe with PS/2 cable connection.