●Function for easy calculation of tax ups and downs. A previously stored tax rate can be added to or subtracted from an amount at the touch of a button ●After entering and storing up to three exchange rates, amounts can be easily converted into the corresponding currencies. This is an advantage when travelling ●Sign change, for example. from 100 to 100 or vice versa, at the touch of a button. Valuable function in any calculation that starts with a negative number ●LC display: liquid crystals using display technology. The user gets a power-saving and efficient display ●The devices are solar powered and are supported by battery operation if required. If the calculator is not used for 6 minutes, it turns off automatically