Most importantly, small drones fly around safely as they read RFID tags on inventory from "tens of meters away" with a 19 cm margin of error, according to a report introducing the system. But warehouse-safe tiny UAVs aren't big enough to carry RFID readers that reach such a range -- so the MIT researchers simply made the drones relay signals from standard readers to items and back. That means these little fleets can work with existing RFID-reading systems, software and tags.

Per MIT's news outlet:

"Between 2003 and 2011, the U.S. Army lost track of $5.8 billion of supplies among its warehouses," says Fadel Adib, the Sony Corporation Career Development Assistant Professor of Media Arts and Sciences, whose group at the MIT Media Lab developed the new system. "In 2016, the U.S. National Retail Federation reported that shrinkage — loss of items in retail stores — averaged around $45.2 billion annually. By enabling drones to find and localize items and equipment, this research will provide a fundamental technological advancement for solving these problems."

RFID isn't the flashy tech it once was, with flash-in-the-pan applications to preserve sake, track aquarium wildlife or update patient tracking in hospitals. But it's still used in plenty of warehouses, so MIT's system, cutely titled RFly in the research team's paper, could be a novel way to autonomously keep track of inventories. Especially whenever Amazon's drones start flying deliveries directly from warehouses.