Essential for those who, like me, wish to play with their Wii U Controller Pro PC. Extremely simple installation, as just plug the adapter into a USB port on your computer and sync it to your controller by pressing two buttons; the keys are already configured. However, if the mapping does not suit you, you can download Useradd free. In short, I am very happy with my purchase, play Dark Souls with a Wii U Pro Controller, it is priceless!
For your information, there is a free software to do it, but you must have the integrated Bluetooth and the software has not particularly intuitive air.