Graphing Calculator is ideal for tasks from algebra through pre-calculus, plus powerful statistics and finance features. Flash technology for electronic upgradability. Financial functions include TVM, cash flows and amortization. Complex numbers. Enhanced data analysis includes logistic and sine regressions. I/O port with unit-to-unit link cable (included). Communicates with computers through USB connectivity kit. (sold separately). Large 64x96 pixel eight-line by 16-character display. 24KB of RAM. Big 160KB archive space for storing up to 10 applications at one time. Applications can also be stored in a computer for later use or linked unit-to-unit. Four AAA batteries included.