You can slow the controls down by extending the length of the stick. Just unscrew the top portion to extend then lock it back down with the bottom set nut.
I don't think he has anything connected to the sticks. It just looks that way. I believe it is his lanyard connection to his RC. He's just smooth and practiced.
If he's talking about that white "thingie" shown at that point - it looks to me like that's just the connecting cable between his mobile device and the USB port on the back of the RC.
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