Specification 100% good condition and Brand new PS/2 CONNECTOR goes to PS/2 port of computer. To enable control BLACK WHITE, MOUSE LEFT BUTTO YELLOW, MOUSE RIGHT BUTTO RED MOUSE WHEEL BUTTON Technical Size: Width: 105mm Length: 100mm Heighth: 43mm Track Ball Size: 4.5CM Diameter, harness include Feature: Smooth trackball rolling action. Fantistic LED trackball. Operates just like a standard 3-Button computer mouse. PS/2 plug and quick connections, will work with any computer through its PS/2 connection. Attached wiring (for push buttons) equipped with .187" female quick disconnects. Long lasting, low power LEDs illuminating clear trackball, When connected the color changes to Red and Green using in built LEDs. 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. Clear ball with Green Lit. Red using leds that light when moved. Package Included: 1pc of LED Trackball Mouse with 4 screws