wearable soundproof microphone for mouth muffles voice of people who talk loud in public

mutalk - Shiftall Inc.

Mutalk Leakage Voice Suppression Microphone Review: Niche and Cringeworthy

morrama develops wearable mixed-reality glasses that flash apps and running games on eyes

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mind-reading AI hat translates thoughts into text so people can read what others are thinking

20W Wireless Voice Amplifier for Teachers with Wireless Microphone Headset, Bietrun Portable Rechargeable(Work of 6 hrs)Loud Bluetooth PA Speaker with Wired Mic Headset for Teaching, Coach, Instructor : Musical Instruments