The TI-83 Plus is an easy-to-use graphing calculator for math and science. Ideal for algebra through pre-calculus, plus powerful statistics and finance features. Offers flash technology to upgrade. Financial functions include TVM, cash flows, amortization, and complex numbers. Enhanced data analysis includes logistic and sine regressions. Graphs 10 rectangular functions, six parametric expressions, six polar expressions, and three recursively-defined sequences. I/O port with unit-to-unit link cable . Offers large 64 x 96 pixel, 8 x 16 display; 24KB of RAM; and 160KB Flash ROM memory for data archive and storage of Apps. Applications can be computer stored for later use or linked unit-to-unit. Calculator is powered by included four AAA batteries with a lithium battery backup to protect RAM memory during main battery change.