Casio fx-115ES PLUS Natural V.P.A.M. Scientific Calculator provides advanced mathematical functionality for students and professionals. This two-way power model utilizes both solar energy and battery backup for reliable performance in any lighting condition. It features a large natural textbook display that shows expressions and results exactly as they appear in textbooks. The device includes a protective slide-on hard case with a quick-reference guide for scientific constants and unit conversions printed on the interior. Ideal for algebra, calculus, statistics, and engineering coursework.