The so-called lamphone technique allows for real-time listening in on a room that's hundreds of feet away.
https://www.wired.com/story/lamphone-light-bulb-vibration-spying/
"The list of sophisticated eavesdropping techniques has grown steadily over years: Wiretaps, hacked phones, bugs in the wall—even bouncing lasers off of a building's glass to pick up conversations inside. Now add another tool for audio spies: Any light bulb in a room that might be visible from a window."
https://www.wired.com/story/lamphone-light-bulb-vibration-spying/
"The list of sophisticated eavesdropping techniques has grown steadily over years: Wiretaps, hacked phones, bugs in the wall—even bouncing lasers off of a building's glass to pick up conversations inside. Now add another tool for audio spies: Any light bulb in a room that might be visible from a window."
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