The Keyboard with Keyguard is a modified keyboard designed for use by individuals with upper extremity disabilities. Available in a standard Windows keyboard with Windows keys, a 101-key mini keyboard, or an extended Macintosh keyboard, the keyboard comes with a pre-attached unbreakable Lexan keyguard with smoothly-finished holes properly aligned with each key to eliminate unwanted keystrokes. COMPATIBILITY: Models are available for use with IBM and compatible computers with AT/PS2 connection or for use with Macintosh computers with ADB or USB connection. DIMENSIONS: The Mini Keyboard is 6 x 11.5 inches. The keyguards are 0.125 inch thick.