This desktop calculator offers reliable performance capabilities with features that include tax calculation, percentage key & currency conversion keys. Desktop calculator shows up to 12 digits on an adjustable display. Soft, color-coded rubber keypad provides great comfort during prolonged periods of use. Backspace key allows you to easily correct your mistakes. Four-function memory is great for tedious calculations, such as square roots or long division. Using both solar & battery power, this calculator will work anywhere you are.