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