USB Numeric Keypad (Black, USB 2.0, Compatible to Windows/ME/2000/XP/2003/Vista/Windows 7) Faster Data Input: Allows for Convenient Data Input. Ideal for Spreadsheet, Accounting and Financial Applications Extra Functionality: "000" and "Backspace" Keys for Improved Productivity. "Fn" key doubles the Applications Plug and Play Connectivity: Easy to Install, Simply Plug Into Your Notebook's USB Slot with No Drivers Required Operating System Supported : Windows ME/2000/XP/2003/Vista/Windows 7