Heavy-duty, two-color printing/display calculator features a 17mm blue fluorescent display with 12 digits. Print 4.8 lines per second with positive numbers in black and negative numbers in red on standard-size paper rolls. Use markup key to perform markups, cost/sell/margin calculations, percent changes, and automatic add-on/discounts. Other functions include three-digit punctuation, clock, calendar/clock calculation, oversized add, subtract, multiply keys, grand total, four-key memory, built-in conversion and average functions, floating/fixed decimal (6, 3, 2, 1, 0 and add), add/constant mode, item count and round up/down selector. Calculator runs on AC power.