11/06/2025
Researchers from the University of Florida and University of Electro-Communications in Japan have found that common digital MEMS microphones in devices like laptops and smart speakers can unintentionally leak audio through weak radio signals. These signals can be intercepted—even through walls—using basic equipment, allowing eavesdropping without physical access to the device.
“With an FM radio receiver and a copper antenna, you can eavesdrop on these microphones. That’s how easy this can be,” said Sara Rampazzi, Ph.D., a professor of computer and information science and engineering at UF and co-author of the new study. “It costs maybe a hundred dollars, or even less.”
Apps that lightly activate the microphone, like Spotify or YouTube, can trigger this leakage. The research team has alerted manufacturers and proposed fixes to address the risk.
Simple, cheap components let people hear everything a microphone picks up.