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This is the $40 speaker-silencing gadget people are using to shut down China's crowds of dancing grandmas
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This $40 Device Is Silencing China's Dancing Grandmas
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![PDF] Understanding the Effectiveness of Ultrasonic Microphone Jammer | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/70d61f803ca1ecf206494ed0dc5d163d1331fd1f/3-Figure1-1.png "PDF] Understanding the Effectiveness of Ultrasonic Microphone Jammer | Semantic Scholar")
PDF] Understanding the Effectiveness of Ultrasonic Microphone Jammer | Semantic Scholar
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What is a Bluetooth Jammer Device and How Do I Use it?
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