Bracelet-“shield” against “indiscreet” electronic microphones

A “shield” device against microphones located in the user’s environment (including hidden microphones) was developed by researchers from the University of Chicago. This hand-worn device, referring to a bracelet, is based on the fact that when exposed to ultrasound, most commercially available microphones leak sound into the audible spectrum. In addition, as the researchers note, the device exploits a

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