12-Digit Portable Printing Calculator with tax and business calculations prints 2.3 lines per second in two colors with positive numbers in purple and negative in red. Calculate business and sales functions with the touch of a few keys. Store tax rates and recall them whenever needed. Functions include clock/calendar, tax calculations, sign change, cost/sell/margin, round off/down, item count and memory. Decimal point system includes 0, 2, 3, and floating positions. Calculator runs on AC power with included adapter or battery with four AA batteries (sold separately) and shuts off automatically after seven minutes of nonuse. 1.1 lb. calculator also features a battery strength indicator.