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Solution; The calculator is used widely,but traditional calculator is used with button。And the operation is cumbersome and time-consuming,This product can read data by scanning and speech reading.It can get the answer quickly and display on the screen. Operation can be revoked, modify by touching the screen. Nib have a stamp tool, so it can print out data if we need to.It's quite suit for students, architects and accountings.Apearance are simple and elegant.And it is easy to carry.we can put it directly into our pocket.