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Bloc haut-parleur sans fil portable sans fil pour le son appareil brouilleur Acquisition Jammer Enregistreur Audio - Chine La Chine Jammer Audio, l'enregistrement vocal Jammer
This is the $40 speaker-silencing gadget people are using to shut down China's crowds of dancing grandmas
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High Power Wireless Music Killer Sound Speaker Jammer No Music Noise Speaker Shielding - AliExpress
Researchers build wearable jammer to stop smart speakers listening in