12 digit calculator is perfect for desktop use either at home or in the office. Features an extra Large LCD tilt display. Cost/sell/margin keys make for quick and easy calculations (simply enter two variables and the third automatically appears). other functions include: mark up Key, automatic tax keys, selectable decimal and rounding slide switches, square root Key, Grand total Key, percent Key, change sign Key, backspace Key, 3 Key independent memory, automatic power down, and Hybrid power (solar/battery backup). 2 year manufacturer..