Another challenge is the robot’s reliance on a strong magnetic field generated by an electromagnetic coil for operation, although researchers believe that further miniaturization could address this issue. Reducing the robot’s size to less than one millimeter could allow it to be powered by weaker magnetic fields, such as those from radio waves.

It’s pretty cool now, but that upgrade sounds crazy. Just imagining a swarm of them powered by a radio station. The morning FM wars will come back, but for real. Tens of thousands of these robots facing off above our heads. Forming a more invasive advertisement path, with counter open source hackers releasing their own clouds, powered by the same frequency, but with radically disruptive goals.