Samsung will offer for Galaxy Note 4 special case with the function of ultrasonic echolocation. The device will allow people with visual impairments to detect the presence of obstacles in the path - obviously reflected from the object signal is somehow transformed into a human-readable notification. Sensitivity sonar can be configured.
In any case, the use of this accessory does not allow a person to go without a cane or a guide, but only facilitate orientation in an unfamiliar place.