Wireless Numpad saves USB interface space, and wireless Bluetooth connection and gets rid of cable fetters, enjoying freedom. Keypad also has an independent power switch button. It can prevent the wireless keypad from being touched by mistake. 21 Keys Wireless Numpad. Its num lock function is independent of any other keyboard that is currently connected. The mechanical switch keypad can ensure a fast response. The mechanical numeric keypad has an automatic sleep function. Its Num Lock indicator is not only the Num Lock indicator but also the Bluetooth Match Code and battery low voltage alarm indicator. Compare with the other standard keypad, the 21 keys extended some keys at the top, containing Esc, Tab, Back Space, and FN keys. It also contains a calculator shortcut key, which allows you to activate the keyboard calculation function at any time.