Elevate your computing experience with the Logitech Trackman Marble Wheel USB Mouse. Designed for comfort and precision, this trackball mouse features a smooth marble wheel that allows for effortless navigation and control. With a robust optical tracking method, every movement is captured with clarity, ensuring accurate cursor placement and reducing fatigue from endless scrolling. This gray Logitech Trackman Marble mouse offers wired connectivity via PS/2 or USB, catering to your setup preferences. It comes equipped with four buttons, including a convenient thumb button, to streamline your workflow. The model T-BC21 (P/N 804377-0000) boasts a 300 DPI resolution, striking a balance between detailed tracking and smooth movement for both work and play.