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shreddit
on July 18, 2024
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Type in Morse code by repeatedly slamming your lap...
It even works offline, just slam harder for “over the air” transmission. Has a shorter range though…
th0ma5
on July 18, 2024
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There is a video of a guy shouting into a can which was changing the pressure of a piezo ... I think they picked it up in the shack but didn't mess with it much more. Completely passive I think.
shagie
on July 18, 2024
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https://en.wikipedia.org/wiki/The_Thing_(listening_device)
Bluestein
on July 18, 2024
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(Talk about "air gapped", eh?
aspyct
on July 18, 2024
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Shorter range and shorter lifespan too :D
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