Generic Mini USB Stretchable Wired 19 Key USB Numeric Keypad for Laptops Notebook PC Computer for Laptops Notebook PC Computer Black ?Ergonomics: Comfortable typing reduces wrist fatigue Easy to Install, Simply Plug Into Your Notebook USB Slot.No software driver require ?Space saving ergonomic 19 key USB numeric keypad with back space and "000" keys for improved productivity Works with PC and desktop computers that have Windows 2000, XP, Vista, or Windows 7 operating systems ?External number keypad, Professional portable, compact design