This model comes with stateoftheart upgrades: an easy to load paper mechanism, curved ergonomic buttons, an on/off switch, and a detailed instruction manual with examples. 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. 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 4 AA batteries not included, giving you the option of mobility. A 2Color Ink Blue and Red printer included within helps you organize your calculations. This calculator uses an industry standard replaceable ink roller, the IR40T, making the ink easy to replace.