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A comment on Mysterious Mac and PC malware that jumps airgaps?. Parent comment

Re:Mysterious Mac and PC malware that jumps airgaps? by chrischen on Sunday November 03, 2013 @10:01PM (#6666508)
The ShopKick app uses consumer grade microphones on iPhones to pick up ultrasound signals from in-store speakers so you can check-in automatically just by opening the app.
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