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We made a small change on the button, that we engrave some braille on it . The first button on the top be engraved “one” in engrave , the second buttons is “two”, the third button is “three” and so on.
According to the fingers touch the buttons , each blind can feel each corresponds of the button to the other half . And the blind man would not face the embarrassment of buckling up the wrong buttons, which also save a lot of time for checking button.