Bluetooth headsets never really caught on because they weren't useful enough.
the iPod was hardly the first MP3 player, and I don't think it did anything better than any other MP3 player on the market at the time other than look pretty and have an apple on it (well, the rotating dial was sort of neat).
Perhaps most intriguing is the description of an advanced headset that projects images directly onto a person's eye. In its description of alternative methods of display, the patent says a version of Google Glass could use "a laser or LED source and scanning system... to draw a raster display directly onto the retina of one or more of the user's eyes."
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