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problem：The blind couldn’t see the position of the button and they often make some wrong ，so whose can be influenced by others.
We made a small change in the blind Braille button button, we in the engraved on it, the first button on top is a, second buttons are two, third buttons are three,... And so on . According to the fingers touch the blind can enjoy each button corresponds to the other half, and the blind man would not be facing buckle wrong buttons embarrassment, but also save a lot of time to check button.