'Battery-free, quiet, and inherently private' — These 3D-printed metal tags could change home and office tracking, turning penny-sized discs into smart devices using ultrasonic tech for maintenance-free monitoring without charging

Researchers at Georgia Tech develop battery-free 3D-printed metal tags for smart tracking that use ultrasonic sound to record everyday actions.

from Latest from TechRadar https://ift.tt/9Cv5fFy