Rokordbox connected to reload mixture controller

Hi all, i'm quite new here and new in the dj scene. I have a DDJ-400 that i use with recordbox, and im happy with it. Now, i often have some time during traveling and i found this reload mixture controller on the market. I found on youtube a guy who has it connected to rekordbox. Rekordbox doesn't automatically recognize this controller thus it doesn't work for the moment.

does anyone know how to get it started, do i have to do something in rekordbox?

Thanks in advance

noob in djing