Such an external numeric keypad touchpad may not be used in general situations, but only in high-end customer systems. For example, Apple phones can be easily controlled with just two fingers. It can be connected to computers, etc. through a USB interface. It has two main functions: one is the numeric keypad, and the other is the touchpad. These two modes can be easily switched with just one button. In some situations where a numeric keypad or touchpad is needed, this computer peripheral can come in handy. It currently sells for $40 abroad.