Umm he did link the adapter he uses in the video... A shame some people can't read /listen properly...
Matter of fact. The exact same adapter he got and linked to is arriving today
If you'd linked a video, it would have been easier. As it is I was left to work out who Kai was and what video you were talking about. The one I found that he used an external mic had people asking in the comments and he didn't reply. Shame people don't know how to post links, life would be a lot easier.
(We still don't know what it's for... yes, we know what you're doing, but not what for, like YouTube, a Vlog etc... but I'm just being nosey now
)
Obviously, see how you go, but as I think I said earlier, one of the common mistakes, in my opinion, is to under estimate good audio. Considering you're spending £500 to £700 on camera, I would go the extra £36 for good audio too