https://www.techdirt.com/articles/20180524/09312539897/daily-deal-nope-portable-sound-microphone-blockers-2-pack.shtml

The Nope Portable Sound Microphone Blocker plugs directly into your device's 3.5mm headphone jack and forces your device to sense an installed mic, turning off your device's onboard microphones, giving you back your privacy. The 2 pack comes with a key chain holder so you can always have them handy. It's on sale for $16.99.

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