Logitech Trackman Marble Trackball Mouse &ndash; Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons, Dark Gray TRACKBALL COMFORT - Sculpted ambidexterous shape supports your right or left hand and stays in one placemove the cursor without moving your arm CONVENIENT CONTROLS - Moving quickly between documents or browsing your favorite Web sites is a breeze with large, easy-to-reach Back/Forward buttons ZERO SETUP REQUIRED - Flexible wired connectivity means you just plug the cable into your USB or PS/2 port - it works right out of the box. PROGRAMMABLE CONTROLS - Configure the buttons to do exactly what you want like switching applications, opening browser windows or jump to full screen while watching videos BUILT BY LOGITECH - This mouse comes with the quality and design weve built into more than a billion mice, more than any other manufacturer Windows Vista, Windows 7, Windows 8, Windows 10 or later Mac OS X 10.4 or later USB port