The Logitech Trackman Corded Trackball Mouse T-BC21 is a brand new wired USB mouse that offers a unique trackball design for precise cursor control. With a maximum DPI of 300 and side-to-side scrolling capabilities, this mouse allows for efficient and comfortable use. Available in red, gray, or white, it features a trackball tracking method and four buttons for added functionality. This versatile mouse can be connected via PS/2 or USB, making it compatible with a wide range of devices.