Choose 12 digits for normal printing or 10 digit mode for big print size. Big print characters are 150% larger than any other printing calculator. Calculator features a thermal printer (no need to replace ink!) that prints 6.0 lines per second and is whisper-quiet. Other functions include: cost/sell/margin keys, constants in multiplication and division, percentage add-on and discount, time/date, change sign key, large-size add and subtract keys, non-print or print mode and others. AC power. 2 year warranty.