USB Numeric Keypad, Portable Slim Mini Number Pad for Laptop Desktop Computer PC, Full Size 19 Key, with Retractable USB Cable Silicone numerical USB keypad with calculator function, Excellent for notebooks & laptops without a number pad. Unique design: With a comfortable key design, you can type dates easily and you can take it with you and you can also realize mobile office. Slim, lightweight, flexible, waterproof and dustproof, retractable USB Cable. 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.