Numeric Keypad C-TECH KBN-01: This numeric keypad by C-TECH is a great accessory to notebooks without a numeric keypad and also offers you four extra keys for office use. Because of them, you can easily and quickly start the calculator, email client, go to the homepage, or go to the next cell of fill-out forms using the Tab key. Due to the low profile, using the keypad is comfortable to control, which you will especially appreciate during long working hours. Key FeaturesLow key profile provides comfort and greatly complements a laptop keyboard4 extra office keys (Home, Tab, Email, and Calculator)Fast and easy to useEasy to UseThe numeric keypad is especially suited for those who often work with spreadsheets, accounting, and other financial applications. There is no need to install any special drivers, just connect the keypad to a free USB port and you can get started right away. Compatibility with Windows XP and later versions is guaranteed.