Fashionable and easy to use calculator; Features: This is a pocket-sized calculator that is convenient to carry. Simple and stylish design. [How to use] / "→" key: You can erase the last number you put it. Enter the tax rate you want to set and enter the "SET" key → "TAX" key, and the set values will be displayed on the screen. Enter a number, then enter "+TAX" and -TAX" to calculate tax incl.