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Ultrasonic Tracking: Are our phones really listening to us?
Twenty Thousand Hertz
Introduction
Ultrasonic tracking is tracking that's done through your microphone. Providers can embed their ultrasonic tones or beacons as they call them into television shows and advertisements. If you have an app on your phone that allows microphone permissions, permissions to record onto your device,. It can eavesdrop on you in the room and light up that microphone when you don't know.
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