The ITAC Systems Inc Mouse Track Serial Port Trackball is a white trackball mouse with six buttons, made by Mouse-Trak. It features a PS/2 connectivity option, making it compatible with a wide range of computers. The X-6XXMP model is designed for precise and smooth cursor control, ideal for users who prefer a trackball over a traditional mouse. With its unique design and reliable performance, this trackball mouse is a valuable addition to any computer setup.