Part of the award-winning Satellite series of Refreshable Braille Displays from ALVA ( http://www.aagi.com/catalogue/ProductVersion.asp?SerieSat) the ALVA Satellite 584 Pro is for professionals and braille enthusiasts. , , It has an extra wide braille display which may be used for high-resolution applications, DOS Windows and data intensive programs. It is designed for use with graphical user interfaces including internet applications, databases and spreadsheets.AL