This calculator has some special shortcut functionalities. The main differences of this calculator from the built-in one are as follows:

1. It memorises the first operand and the action. For example, if you need to multiply 7.25 consistently by 4, 54, 2.5, and so on, you should perform the following action first: 7.25*4=. And then press 54=, 2.5=, etc.
2. Simplified operations with one operand.
I.e. 2*== is the same as 2*2*2=
3. Easier operations with interest:
To calculate 42% of 250, press 250%42=
Or to compute 15.5 minus (5% from 15.5), just do 15.5-5%
4. Possibility of successive calculations. E.g. 2+3-1/9*5=, etc.
5. Activity of the keypad buttons depends on possibility of certain actions.
6. Non-volatile memory cell.
7. For sound confirmation of pressing the buttons, place any small file named "Sound 1.wav" into "E:/Sounds" folder.