The Logitech Trackman Marble Trackball Wired USB Mouse T-BC21 is a reliable and efficient trackball mouse designed for precision and ease of use. With a maximum DPI of 300, this mouse allows for smooth and accurate tracking. Featuring a thumb button for additional functionality, this optical trackball mouse offers a unique and comfortable way to navigate on your computer. The Logitech Trackman Marble's wired connectivity ensures a stable and consistent connection, making it a dependable choice for everyday use.