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  "path": "/pro/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",
  "publishedAt": "2026-04-28T18:20:00.000Z",
  "site": "https://www.techradar.com",
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  "textContent": "Researchers at Georgia Tech develop battery-free 3D-printed metal tags for smart tracking that use ultrasonic sound to record everyday actions.",
  "title": "'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"
}