For decades, the blind have used canes to get around. Now a special wristband gives them a 'sixth sense.'
Watching Fernando Albertorio stroll down a crowded sidewalk in downtown Washington during a recent lunch hour, casually sidestepping pedestrians running errands and crowding around food trucks, you'd have no idea he is legally blind.
Albertorio easily blends into the flow of human traffic swirling around him, which is even more remarkable considering that he is doing so largely without the use of his limited vision.
His secret: a wristband called Sunu that emits a high-frequency soun...