USB Numeric Keypad, Jelly Comb N001 Portable Slim Mini Number Pad for Laptop Desktop Computer PC, Full Size 19 Key, Big Print Letters - Black PlUG-and-PLAY device: no drivers required; USB port required. Full-size 19mm keys improve speed and accuracy by making it easier to locate and press the numbers you are looking for. Numeric keypad supports NumLock. QUIET SOFT TOUCH: Integrated ergonomic tilt provides added comfort which helps reduce strain, great for those working on spreadsheets, accounting files or financial applications. COMPATIBILITY: Works with PC and desktop computers that have Windows 2000, XP, Vista, or Windows 7 operating systems.