12-digit printing desktop calculator features two-color printing, tax & currency exchange function, three-digit comma marker, a large display & large footprint for easy operation. It prints 2.4 lines per second in black & 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 & markup / markdown. It runs on AC power with included adapter or four AA batteries (sold separately). Calculator weighs 1.5 lb.