Graphing calculator is designed for surveying, engineering, math and science professionals and students. Features a large equation library, more than 2,300 built-in functions, 75Mhz ARM9 processor, a SD card slot with formatting functions, RPN, Algebraic and Textbook data entry, large high-contrast screen (9 lines x 33 characters), serial port and plastic casing. Easily performs complex arithmetic and calculus functions with advanced Computer Algebra System (CAS). Calculate advanced expressionsand view solutions in 2-D or 3-D graphical representation. 2.5MB total memory includes 512KB RAM plus 2MB flash ROM for performing future upgrades. Enhanced HP keypad with redefinable keyboard and menu keys reduces keying errors. Customize data withfour font sizes and styles. HP Solve application allows you to type and store an equation, then use to solve any variable. Calculator includes a USB connectivity kit with USB cable, connectivity software and pouch. Runs on four AAA batteries.