Large 12-Digit Two-Color Printing Calculator. Re-Print Function - Print Duplicates. Check Function - Check and Correct up to 150 steps. Clock & Calendar Function - Print Time & Date. Grand Total Function. Cost / Sell / Margin. Quick Correction of Input Mistakes. Tax Calculations. Uncluttered Keyboard with Maximum Spacing. Two-Way Power: AC Adapter (Included) Batteries (Optional).