Engineers at UC Berkeley have developed the world’s smallest wireless flying robot, measuring less than a centimeter in diameter and weighing just 21 milligrams. Inspired by bumblebees, the tiny device can hover, change direction, and hit small targets with precision.

Unlike larger drones, the robot has no onboard battery or flight electronics. Instead, it uses an external magnetic field to generate lift and steer by spinning two tiny magnets embedded in a propeller-shaped body allowing more precise control.