VisionBoard2 is a large key, large print keyboard designed for use by individuals with low vision, arthritis, or fine motor disabilities. This keyboard has large tying keys and oval function keys. COMPATIBILITY: For use on IBM and compatible personal computers or Macintosh computers. SYSTEM REQUIREMENTS: Windows 98SE, 2000, ME, XP, Vista, or MAC OS 10.1.5 or higher and a USB port. DIMENSIONS: 19 x 1.5 x 7 inches. The keys are 1-inch square. COLOR: Model VB2 has a black case with white keys. Model VB2Y has a black case with yellow keys. Both models have black key labels. WARRANTY: Limited lifetime warranty.