The Logitech T-BC21 Trackman Marble 810-000767 is a black wired mouse body specifically designed for trackball enthusiasts. It features a maximum DPI of 300 with an optical tracking method and includes a thumb button for added functionality. This mouse, known for its reliability and precision, is a great choice for users looking for a comfortable and efficient pointing device for their computer or workstation. The Logitech brand ensures quality and performance in this unique trackball mouse.