The ReaderBoard is a large print keyboard designed for use by individuals with low vision. This keyboard has larger keytop labels than standard keyboards. COMPATIBILITY: For use with IBM and compatible computers and Macintosh computers. SYSTEM REQUIREMENTS: IBM and compatible computers require Windows 98SE, 2000, ME, XP, or Vista. Macintosh requires OS 10.1.5 or higher. Both systems require a USB port; a PS/2 adapter is included. DIMENSIONS: 18 x .75 x 6.75 inches. WARRANTY: Limited lifetime warranty.