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Optimouse  ·  3078 days ago  ·  link  ·    ·  parent  ·  post: Beware of ads that use inaudible sound to link your phone, TV, tablet, and PC

So for a device to be afffected by this, wouldn't it have to be on, unlocked, and interprate the signal? Does my phone always have a running microphone checking for certain high frequency noises? How do they implement this?