Adding Machine For Accounting Use, Two Color Printing, 12 Digit Lcd Display [IMPORTANT!] - This is an adding machine and DOES NOT function like a standard desktop calculator. For example, to do the equation 4 - 2, you would need to press ?4? then ?+? then ?2? then ?-? then ?equals? to get the right answer. Tutorials and examples are provided in the detailed instruction manual. [MAJOR UPGRADES] - This model comes with state-of-the-art upgrades: an easy to load paper mechanism, curved ergonomic buttons, an on/off switch, and a detailed instruction manual with examples. [CLEAR DISPLAY] - Featuring a 4 inch screen, this calculator supports up to 12 digits - allowing you to calculate large numbers at a time. The screen is also very clear and easy to read, relieving strain on your eyes. [TWO POWER SOURCES] - An AC adapter is included so you never have to worry about running out of power. However, if you want to travel, this calculator is also for you. It supports 2 AA batteries (not included), giving you the option of mobility. [2- COLOR PRINTER] - A 2-Color Ink (Blue and Red) printer included within helps you organize your calculations. This calculator uses an industry standard replaceable ink roller, the IR-40T, making the ink easy to replace.