I was also too distracted by seeing that to enjoy the scene it was in fully as I was worried it was going to turn into some pseudoscience advert, but also realized that had I not heard about the magic bracelet thing here, I wouldn't have thought of it as that, as it has nothing to do with magic magnet powers or anything,
One would assume those are mini-repulsors, yes.
Are folks really so obsessed with seeing power band braclets or whatever the f#$k they're called and rooting out the pseudoscience injustice in the world, that they will let such things bother them when they watch a movie about gods and space monsters attacking the Earth?
EDIT: Could very well be a homing device. I guessed repuslors because I haven't seen the movie yet, but Iron Man's primary weapon always seems to shoot from his hands....