The KB-120 Numpad offers a comprehensive number block with 23 keys, as found on almost every standard keyboard. So you can add the Numpad if you don't have a number pad (e.g. on tablets or notebooks) or simply use it in addition to the connected standard keyboard.
In addition to the numeric keypad, there are function keys for browser, e-mail and calculator that enable quick access. With the separate keys for TAB, Backspace and 000, additional keys are available.