Get a full-size keyboard feel and function in a compact folding design. - Easy plug-and-play interface connects with your Treo easily - Folds to easily travel in your bag or pocket - For charging while you type, use the plug adapter included with your existing AC charger System requirements (for software driver installation): Windows 98, NT4.0, 2000, ME, XP or Macintosh OS 9.1 or later Compatibility: Treo 600 only NOTE: Not compatible with Treo 300, 270, 180 or 90 P.S. Phone on the image is sold separately.