The Natural Keyboard Elite, model A11-00337, is a modified ergonomic keyboard designed to reduce strain while working on a computer. This keyboard has a split, gently sloped shape that encourages a natural hand, wrist, and forearm position. Special keys allow the user to access common tasks, including product information, registration, and settings for devices such as cell phones, cameras, printers, mice, keyboards, and webcams. The keyboard connects through either PS/2 or USB ports. COMPATIBILITY: For use on IBM and compatible computers running Microsoft Windows. SYSTEM REQUIREMENTS: PS/2 port connection requires Windows 3.1 through 7, Windows NT Workstation or Server version 3.51 or later, or Microsoft MS-DOS version 3.1 or later operating system. USB port connection requires Windows Vista, XP, 2000, Millennium Edition, or 98. WARRANTY: 3 years.