12 digit calculator is perfect for the occassional user, especially in a small office or home office setting. Thermal printer requires no ink roller or ribbons, saving on costs and waste, and allows for super fast and quiet printing. Automatically prints in extra-large size if 10 digits or less, and normal size for 11 or 12 digits. Features an extra large LED display for easy viewing. Cost-Sell-Margin keys allow the user to enter two variables to find the third.