Features: Smoothly trackball rolling action Operates just like a standard 3-Button computer mouse USB plug and quick connects, will work with any computer through its USB connection Attached wiring (for push buttons) equipped with 0.187" female quick disconnects Long lasting, low power trackball Low cost real trackball works with any PC application (including MAME) Can be used on a PC as a mouse or connected to your arcade cabinet Connection: USB CONNECTOR - Goes to USB port of computer. To enable control BLACK - GND WHITE - MOUSE LEFT BUTTON YELLOW - MOUSE RIGHT BUTTON RED - MOUSE WHEEL BUTTON Size: Width: 105mm Length: 100mm Thickness: 43mm Track Ball Size: 45mm Diameter, harness included Package Includess: USB Arcade Game Trackball Mouse Illuminated LED Round 4.5cm USB Connector Screws