Description: Sturdy metal key design Fits key ring (Key ring not included) Ultra portable USB Drive Works with any USB 2.0/1.1 port Fast transfer rates (Read mode: up to 30 MB/s; write mode: up to 10MB/s) Ultra-mobile and lightweight Size : 57mm x 24mm x 3mm (2.24" x 0.94" x 0.12") Color: SilverOperating System: Windows ME, 2000, XP, Vista, CE 3.0 or higher: No software required Macintosh Mac OS 9.0 and Mac OS X - No software required Windows 98SE - Driver requiredPackage Include: 1 x 4GB metal key shape USB flash memory