The Kensington Expert Mouse Trackball Model #64215 Vintage is a classic trackball mouse with a sleek gray design. It features wired connectivity via PS/2 port, making it compatible with older systems. With four buttons for precise control, this trackball mouse is a reliable choice for those who prefer its unique pointing mechanism over a traditional mouse. Made by the trusted brand Kensington, this unit is a practical and stylish addition to any computer setup.