Casio - CSOFX260SOLARII Scientific calculator features a 10-digit display with two extra digits to tackle a variety of calculations in an easy-to-use device. Solar-powered design provides complete reliability for convenient use virtually anywhere. Slide-on hard case protects the calculator when not in use for safe storage and transportation. 144 built-in math functions speed up your calculations to simplify your calculations. Scientific calculator also includes store/recall, backspace key, exponential functions and more. Calculator is perfect for general math, pre-algebra, algebra 1 and 2, trigonometry, statistics and science.