The 12 digit LCD can be used with large numbers but the two color printing makes it easy to see the difference between positive and negative values. Built-in calendar and clock function. Professional keyboard layout allows you to type numbers quickly. Cost and sale, and margin keys make it easier to determine profit margins and four key memory allow you to store commonly used numbers and speed up your input. Built-in gramming key allows you to add multiple calculations with the push of a button. This sharp printing calculator is flexible both battery and AC power supply.