Enfain 4GB USB 2.0 Flash Drive Black Color (4GB, Black) Chip: Grade A, original Toshiba brand USB 2.0 Compatible (Backwards compatible to USB 1.1) Operating System : Windows 7/Vista/XP/2000/ME/NT/98,Linux and Mac OS Operating Temperatures : 32 F to 140 F (0 C to 60 C) , Storage Temperatures: -4 F to 185 F (-20 C to 85 C)