Etrema, an innovative technology firm based in Iowa, sells chrome discs for US$1,500 a pair. Called Whispering Windows, they can turn any wall, window, drab conference table or even your head into a speaker
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Etrema, an innovative technology firm based in Iowa, sells chrome discs for US$1,500 a pair. Called Whispering Windows, they can turn any wall, window, drab conference table or even your head into a speaker
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