A good wireless numberpad from Logitech cost around $40, but if you have an iPhone you can spend only $2 and convert your iPhone into a wireless numpad. NumberKey is a small app that can convert your iPhone into a wireless touch number keypad.
It can connect via both WiFi and direct wireless connection(ad-hoc) with Windows and Mac. You will need to install the NumberKey Connect app on the system. Once installed, it will automatically detect your iPhone and show the status. Hit Connect to establish a connection, make sure the app is running on iPhone at the same time.
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