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. The LED Trackball with USB & PS/2 interface allows personal computers to easily interface with the standard "Arcade Quality" trackball and pushbuttons via either the USB port or PS/2 connector without the use of any external power supply. The USB & PS/2 trackball can be added with or without removing the original mouse. The device will be automatically configured as soon as it is physically plugged into the USB port or hub, without the need to reboot or run setup. Connects directly to either a PS/2 (mouse) port or a USB port on a PC. Compatible with Windows 98 or higher and Mac OS 8.5 or higher, Linux with USB HID support. External 12 VDC power supply required for LED. Comes with a 6-foot cable that plugs into a USB or a PS/2 port. Supports up to three buttons. (Three-button functionality will require the use of a driver that supports three buttons. The standard MS driver supports only two, and the MAC OS supports only one). Includes both .187" and .250" terminal connectors for pushbuttons. Patterns & Colors easily selectable via switch on bottom of trackball. Durable black polycarbonate plastic material. Exceptional performance and precision is achieved from harden steel shafts. Pushbuttons and mounting plate kits are sold separately Specifications: Color: Red/Green/Blue LED Color: RGB LED Type: RGB Trackball Size: 3" Voltage: 12 VDC