The Logitech T-BC21 Marble Mouse USB 804377-0000 is a genuine 4-button trackball mouse designed for comfort and precision. With a sleek gray color and ergonomic design, this trackball mouse offers wired connectivity via USB and optical tracking method for smooth performance. The DPI maximum of 1000 ensures precise cursor movement, making it ideal for navigating through various computer tasks with ease. Made by Logitech, a trusted brand in the industry, this trackball mouse is a reliable and efficient choice for those in need of a quality pointing device. Has a tiny amount of rub on the top. See pictures for condition. This is the active item which you see is what you will get. If you have any questions please feel free to ask. Thank you for your consideration.