The Natural Ergonomic Keyboard 4000, model B2M-00012, is an ergonmic keyboard designed for use by individuals with carpal tunnel syndrome or upper extremity disabilities. The ergonomic design encourages natural wrist and arm alignment so the user can work without discomfort. A plush, integrated palm rest is included. A zoom feature provides close-ups. Commonly used keys such as the equal sign, left and right parentheses, and backspace are located just above the number pad. Customizable hot keys can be used for e-mail, the Internet, taskbar programs, documents, multimedia, and accessing product information, registration, and settings for devices such as cell phones, cameras, printers, mice, keyboards, and webcams. Function keys are lockable to avoid unintentional engagement. COMPATIBLITY: For use with IBM and compatible computers. SYSTEM REQUIREMENTS: Windows 7, Vista, XP Pro/Pro x64 Edition/Home/Media Center Edition/Tablet PC Edition, or 2000, Service Pack 4 or higher; 60 megabytes (MB) free hard drive space; CD-ROM drive; USB port. WARRANTY: 3-year limited warranty.