The Switch Interface Pro is a control input interface designed to enable individulas with upper extremity disabilities to operate computers using switches. This unit moves easily between Macintosh and personal computers (PC) and enables up to five single switches (not included) to be connected to control computer functions. The unit is preprogrammed with mouse clicks and keyboard functions. Macintosh users can access a mouse click and the numeric keys 0,1, 2, and 3. PC users can access arrow keys, CAP lock, space bar, Enter, Tab, Shift, backspace, scroll lock, numeric keys 0 through 4, Num lock, click, right click, and double click. Information required for operating the interface is printed directly on the unit. COMPATIBILITY: For use with IBM and compatible computers and Macintosh computers. SYSTEM REQUIREMENTS: PS2/ADB connection.