12 digit commercial desktop calculator is perfect for desktop use either at home or in the office. Features an extra-large LCD display and an extra-wide keyboard and kick stand. Multiple Use key simplifies business calculations to save time and increases efficiency by handling functions like margin, markup, selling prices, costs, percent changes. Other functions include: selectable decimal switch, rounding slide switch, mark up key, square root key, grand total key, percent key, 4 key independent memory plus second two-key memory, add mode, plus/minus equals keys, change sign key, backspace key, double zero key, automatic power down, and constant and sigma mode selectors. Operaters on twin power (solar/battery backup).