Hi Everyone, I am new to the game. Just purchased and set up a new E-flite Apprentice. Went thru the instructions step by step. Eveything seems ok, but I don't understand the "range test". How does holding the trainer switch while checking all the functions at 90 feet differ from checking functions at 90 feet without holding the trainer switch?? I know there has to be a simple answer but I'm just not seeing it.

Thanks