Logitech Trackball Mouse

This trackball optical mouse offers a contoured shape and ambidextrous design for comfort during long periods of use. Smooth fingertip control with just a slight touch on the trackball lets you control the cursor with superior speed and accuracy. Marble optical technology offers enhanced precision, ensuring faster response and smooth, reliable tracking. Four customizable buttons for easy access to key tasks. Connector/Port/Interface: PS2, USB, with cord. Logitech, No Substitute.