*Function -Number of screens 1 to 6 -arithmetic -character Back button -input clear button -± swap reversal button -Setting the number of decimal places (not specified, 0-5 Digit specification) -setting of rounding (not specified, truncated, rounded, rounded up) -the character size change -change of tap sound -change of vibration at the time of tap *How to use 1. Enter like a normal calculator. 2. If you press the [=] button it will be recorded in the history. 3. You can change va