12-digit printing desktop calculator features two-color printing, tax and currency exchange function, three-digit comma marker, a large display and large footprint for easy operation. It prints 2.0 lines per second in in black and red ink. Calculator also features an independent memory, cost/sell/margin, item counter, nonadd, tax calculation, automatic constants, grand total, right shift key, round off, profit margin percent, and markup/markdown. It runs on AC power with included adapter or four AA batteries (sold separately). Calculator weighs 1 lb.