So in that movie, when Bruce Wayne makes his public appearance at the charity ball, when he gets out of his car, cameras start flashing and he has something in his hands. He presses a button that renders all cameras useless. What is that device and how does it work? Is it like a mini EM pulse? But that would affect all electronics in its range. In the movie, it is implied that everything else like other bulbs/lights work fine. It's only the cameras that don't work all of a sudden.
And is it on his motorcycle too? Because the cops complain about the lights when he's in the tunnel, and the lights seem to be going with him. As he moves away the lights come back on.