the original controller doesn't have remove control wire and plug, the new controller do have remove control wire and plug, I plug the remove control device that seller sent to me 1 year ago. but it didn't work ok. sometime work, but sometime didn't work. as result, I give up to install remove controller.
so far it work ok, but I feel, when bike climb hill, I feel power is less compare to old controller. anyway, at least , it work ok. I am not going to bother again.