Trust KP-4100p Wireless Keypad/MouseKP-4100p Wirelessnumeric keypad with built-in calculator and compact wireless optical mouse. The perfect supplementto the keyboard of your notebook; ideal for financial applications and spreadsheets. Calculations can be sent to active computer programs directly. Compact USB receiver that can be stored inside the bottom of the keypad. With Num lock, backspace anddouble zero key. Basic functions also possible, like Home, End, Page up/down, etc.