Only �" thick at its highest point, this compact and slim numeric keypad featuring full-size keys makes touch-typing a synch for accountants and road warriors. The PAUK10U slim keypad includes a backspace and "000" key, for improved typing efficiency and convenience. The Numeric Lock does not synchronize with the laptop computer's built-in keyboard, therefore will not lock up the alpha keys. The USB cable ensures plug and play and requires no driver software.