Texas Instruments TI-84 Plus Graphics Calculator, Black Preloaded with software, including Cabri Jr. interactive geometry software. Up to ten graphing functions defined, saved, graphed and analyzed at one time. Advanced functions accessed through pull-down display menus. Horizontal and vertical split screen options. I/o port for communication with other TI products. Powered by 4 trial AAA batteries (Best with Polaroid AAA Batteries) with a lithium battery backup to protect RAM memory during main battery change