The Palm-Powered PEG-S360 provides everything you need to stay organized and entertained. Slim and sleek, it has been designed to fit your hand just as comfortably as it does your life. In addition to the 16 MB internal memory, the Memory Stick media expansion slot offers unlimited storage capability for all your favorite applications2. View and edit Microsoft Word and Excel files on the go1. Plus, the unique Jog Dial navigator provides easy access to most of your stored information. Very unique, very Sony.