Enhance your computer experience with the Logitech USB Trackball Mouse. This mouse features a marble ball tracking method that allows for smooth and precise movement. With five programmable buttons, you can customize your mouse to fit your specific needs. The ergonomic design of this mouse reduces discomfort and allows for prolonged use. This Logitech TRACKMAN model is connected via USB and has a maximum DPI of 300. The unit quantity is one and it is made in China. The mouse is in good working condition and has been tested to ensure it works properly.