** 3 Inch Illuminated Trackball by RetroArcade.us designed specifically for PC and MAC via USB or PS2 ports **Also works with the 2100-IN-1 and other Mega PCB Boards. Product Information The RetroArcade.us Trackball is an "Arcade Quality" trackball and will work with your PC or Mac. The device will be automatically configured as soon as it is physically plugged in. Add a dramatic effect and attract more attention to any game with this color changing trackball! 3" diameter diffused ball to provide uniform illumination of the ball. 4 Ultra bright multi-color RGB LEDs Pre-Programmed with 4 unique patterns and 8 different color combinations. Patterns - Solid, Chase Pattern 1, Chase Pattern 2, Color Fade & Then Color Change Colors - Red, Green, Blue, Yellow, Orange, Purple, Light Blue, Light Purple. (Requires 12v power source - not included) The LED Trackball with USB & PS/2 interface allows personal computers to easily interface with the standard "Arcade Quality"