Logitech TrackMan Marble wired USB trackball mouse, Model T-BC21, P/N 810-000767.Tested and works properly. Trackball movement and mouse functions are operational.Features the distinctive red optical trackball, amofferextrous design, four-button layout, and wired USB connection. Great replacement mouse or option for anyone who prefers a stationary trackball design.Details:* Brand: Logitech* Model: TrackMan Marble T-BC21* P/N: 810-000767* Connection: Wired USB* Trackball color: Red* Color: Gray* Tested and working* Mouse only; no original box or additional accessoriesPre-owned condition with minor cosmetic wear from normal use. Please see all photos for exact condition. You will receive the exact item pictured.