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The Handy- for a person who is visually impaired.
Dolphin and Bats, such as animals of using supersonic waves, are knowing for its on behalf of the sense of sight, but, humans are unable to ultrasonic. so, we are used to transforming respiration in order to activation of a magnifying sonic wave with respiration.
Chungju-si, South Korea
Uijeongbu-si,Gyeonggi-do, South Korea