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This is called a speech jammer. It inhibits most people's ability of talking by recording their voice and playing it back to them with a delay of about 0.1 seconds. This effect
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Portable Wireless Block Wireless Speaker Jammer Device for Sound Acquisition Audio Recorder Jammer - China China Audio Jammer, Voice Recording Jammer | Made-in-China.com
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Music Killer Speaker Jammer Audio Dual frequency Pulse Wireless For Outdoor Subwoofer Heavy Bass Speaker Shielding - AliExpress
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Bloqueur D'enregistrement D'appel Brouilleur D'enregistrement Audio Vocal Terminateur Basse Fréquence à Ultrasons 100-240V Détecteur Anti-Espion Protecteur de Confidentialité(#2) : Amazon.fr: Instruments de musique et Sono
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Dual frequency pulse Wireless Music Killer Speaker Jammer For Outdoor Portable Subwoofer Heavy Bass Speaker Shielding Jammer
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