The Logitech TrackMan Marble FX T-CJ12 Wired Trackball Mouse is a reliable and efficient pointing device for computers. With a white color and a maximum DPI of 1000, this trackball mouse offers precise and smooth cursor movement. The wired connectivity ensures a stable connection, while the optical tracking method provides accurate and responsive input. Made by Logitech, a trusted brand in computer peripherals, this trackball mouse is a unit that has been tested and confirmed to work effectively.