The Logitech T-BB18 Trackman Wheel USB Trackball Mouse is a gray optical mouse with a unique trackball design. It features a scroll wheel and has two buttons for navigation. This mouse is designed for precision and ease of use, making it a reliable option for those who prefer a trackball over a traditional mouse. With its USB connectivity and optical tracking method, the Logitech T-BB18 offers a smooth and efficient user experience for controlling various computer functions.