According to Instructables, invisible headphones are more or less tiny magnets that you insert into your ears that pick up signals from a coil of magnetic metal fashioned into a necklace. When connected to an amplifier and MP3 player it allows you to have invisible wireless headphones. While the Instructables site it was based on tells you to put the magnets in your ears, Rich Lee went one step further and had them implanted permanently. While he still has to wear the coil necklace and amplifier to pick up sound, it works much in the same way as the bone induction audio used by Google Glass. He says:
"Listening to music is nice and probably the most obvious answer, but I intend to do some very creative things with it. I can see myself using it with the GPS on my smartphone to navigate city streets on foot. I plan to hook it up to a directional mic of some sort (possibly disguised as a shirt button or something) so I can hear conversations across a room. Having a mic hooked up to it and routed through my phone would be handy."
"You could use a simple voice stress analysis app to detect when people might be lying to you. Not to say that is a hard science, but I'm sure it could come in handy at the poker table or to pre-screen business clients. I have a contact mic that allows you to hear through walls. That might be my next implant actually."
Since his eyesight is deteriorating he plans to hook up an ultrasonic range finder, effectively giving him a bat-like echolocation ability so he can detect objects through sound (almost like a real-life Daredevil). There are other dangers though as he probably won't ever be able to get a CAT scan (the electrical magnets in the scan would rip the magnet implants right out) or get near to other powerful magnets. Check out the invisible headphones instructable video below:
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