This award winning 18 key USB Numeric Keypad is ideal for any laptop or desktop. The low profile keys are comfortable, easy to use and the perfect complement to your system for anyone working on spreadsheets, accounting or financial applications. Anyone who works with numbers on a notebook computer will appreciate the power and portability of the USB Numeric Keypad. Just plug and play. No software required. It co-exists with standard keyboard. Compatible with any PC XP, Vista, Win 7 and Apple as long as the system has a USB port. "Spill-resistant". CPA "adding machine" style - simple and durable. MCI