The BrainPort V100 consists of a pair of dark glasses and tongue-stimulating electrodes connected to a handheld battery-operated device. When cameras in the glasses pick up visual stimuli, software converts the information to electrical pulses sent as vibrations to be felt on the user's tongue. Like most sensory substitution devices, "seeing" with your tongue may not be intuitive at first. But the researchers who developed the device tested it over the course of a year, training users to interpret the vibrations. Studies showed that 69 percent of the test subjects were able to identify an object using the BrainPort device after a year of training. However, the device is expensive; Wicab told Popular Science that it will cost $10,000 per unit, the same as its price when first reported back in 2009.