Casio fx-9860GII Graphing Calculator, Black REF/RREF function, random integers, unit conversion, new types of regressions, chi-squared GOF function, 9 new probability functions, pie charts & bar graphs, graph X=f(Y) and much more 1500 KB Flash ROM Built-in eActivity and spreadsheet applications Icon-based menu adds to overall intuitive usability Direct connection to Casio projectors Data transfer from unit-to-unit and from unit-to-computer New LCD backlight for superior visibility New manager software available