Below is a breakdown of what these "Touch" and "Bluetooth 4" keyboard apps do and how to get them. What is Touch/Bluetooth 4 Keyboard & Mouse?
require you to install software on your computer, making them plug-and-play. Are you looking to use this to control a PC or are you trying to use an external keyboard on your phone? Bluetooth Keyboard & Mouse - Apps on Google Play Touch 4 Keyboard Mouse Apk Download