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lesuorac
35 days ago
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Batteries Not Included, or Required, for These Sma...
Well, idk if these do but you can certainly make passive devices that penetrate walls.
See
http://en.wikipedia.org/wiki/The_Thing_(listening_device)
jacquesm
35 days ago
[–]
Radio waves != sound waves.
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See http://en.wikipedia.org/wiki/The_Thing_(listening_device)