Corrected entry: When Hiro is showing off his Micro-Bots at the SFTT he puts the metal headband thingy on and the Micro-Bots start constructing themselves. Then when he takes it off all the Micro-Bots fall to the ground. However, near the end of the movie Callaghan is using the Micro-Bots to push Hiro and Baymax into the teleporter, without any help from the metal headband.
SantaJim
5th May 2015
Correction: The control headband is mounted in the Kabuki mask Callaghan is wearing.
SantaJim