ERGONOMIC DESIGN FITS IN THE PALM OF USER'S HAND FOR ULTIMATE PORTABILITY;ON-BOARD BACKUP BUTTON FOR CONVENIENCE; DOUBLE-INJECTED, RUBBERIZED DESIGN REMAINS STATIONARY ON DESK OR IN BAG; NO BATTERIES OR EXTERNAL POWER SUPPLY REQUIRED; SPEED INDICATOR LIGHT INDICATES USAGE OF USB 1.1 OR USB 2.0 SPEEDS;WORKS WITH WINDOWS(R) & MAC(R);INCLUDES BACKUP & SYNCHRONIZATION SOFTWARE, TWO ADDITIONAL INTERCHANGEABLE COLOR FACEPLATES, ON-BOARD BACK-UP BUTTON FOR CONVENIENCE & USB CABLE;160 GB