Ideal for Algebra, Geometry, Pre-Calculus, Statistics, Chemistry and more Includes 20MB of internal memory. Multiple representations: lets you view the same calculation 4 different ways. Large display measures 3.5in. diagonally with a sharp 320 x 240 resolution. Alphanumeric display allows you to combine text with numbers. Automatically shuts off when not in use to save battery power. Has a full-color backlit screen. Includes a rechargeable battery. Computer Algebra Systems (CAS) helps students better understand algebraic concepts. Includes exploration tools for teaching and learning concepts from Pre-Algebra to Calculus. Texas Instruments(R) TI-Nspire(TM) CAS Graphing Calculator is one of many Graphing Calculators available through Office Depot. Made by Texas Instruments.