Secret Sunglasses Headphones

I've always wanted a way to secretly talk with people. I've always wished for some sort of secret headset. I came across bone conductors and they're really cool little speakers. Bone conductors are like speakers but instead of creating sound waves with a speaker cone, they transmit the sound in vibr...

By: ziah



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from Instructables: exploring - technology http://ift.tt/1GwrD9L