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How to Make an emergency microphone from a pair of headphones « Hacks, Mods & Circuitry :: Gadget Hacks
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Amazon.com: Bulk Classroom Headphones With Microphone (10 Pack) - Superior On-Ear Bulk Headphones for School: Best for Students K-12 Classrooms (Rotating Boom Mic, Great Recording Quality, Durable, Easy-to-Clean) : Musical Instruments
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