A one way radio receiver powered by the radio signal it's receiving (similar to a crystal radio), with a tiny crystal or piezo speaker, and using bone conduction to get the sound to the inner ear.
How small can it be, and can it be taped or glued to the bone behind the ear (similar to the way Google Glass conducts sound)???
Is it possible to make this tiny radio say 1/8th of an inch in size or smaller???
How small can it be, and can it be taped or glued to the bone behind the ear (similar to the way Google Glass conducts sound)???
Is it possible to make this tiny radio say 1/8th of an inch in size or smaller???