This Logitech Trackman Marble USB T-BC21 Mouse is a great addition to your computer setup. With its wired connectivity and PS/2 and USB capabilities, it provides a seamless and responsive tracking experience. The four buttons, including the thumb button, make it easy to use and the optical tracking method ensures precise movements. The gray color and sleek design add a touch of style to your workspace. This mouse is perfect for anyone who wants a reliable and efficient tracking device.