Texas Instruments Nspire CX II CAS Graphing Calculator - Rechargeable, Computer Algebra System (CAS) - Battery Powered - 2" x 7.3" x 11.8" - Gray - 1 Each Faster performance, added interactive visuals and easier-to-read graphics expand this graphing calculator's classroom-proven ability to support inquiry and discovery. Built-in, Computer Algebra System (CAS) engine enables students to perform symbolic as well as numeric calculations. Integrated mathematics templates permit you to enter expressions and see math symbols, formulas and stacked fractions just as they are printed in textbooks and on the board. Animated path plot allows you to easily visualize function, parametric and polar graphs as they're draw in real time. Dynamic coefficient values let you explore direct connections between dynamic coefficients in equations and graphs. New app icons, supported by color-coded screen tabs, improve the user experience for easy navigation and use. Rechargeable battery reduces the risk of running out of power unexpectedly and eliminates the need for routine battery replacement.