Product Details  revolving usb flash drive, circumrotate USB pen drive, excellent usb drive with CE, ROHS  revolving usb flash drive, circumrotate USB pen drive, excellent usb drive with CE, ROHS Specification of our USB disk: Hi-Speed USB 2.0 Certified  Compatible with USB 1.1  For Mac and PC, No Driver Req.*  No External Power Required  Functions as Hard Drive  Automatic system detection as a removable disk.  Shock Resistance: 1000G  Min. Data Retention: 10 Years  OperationSystem:WindowsME ,Windows2000,WindowsXP,Linux2.4 or above, Mac DS9.0, vista