Electronically upgradeable graphing calculator allows you to have the most up-to-date functionality & software applications. TI graph link offers increased capacity & speed. Seven different graph styles for differentiating the look of each graph drawn. Advanced functions accessed through pull-down display menus. Horizontal & vertical split screen options. I / O port for communication with other TI products. Power Source(s): Battery; Display Notation: Graphic; Number of Display Digits: 10; Display Characters x Display Lines: 16 x 8.