Features over 279 functions and provides its user with everything they need for most mathematical calculations. Its standout feature is its 2-line natural textbook display that displays fractions, formulas, square roots and other expressions as they would in your textbook. Solar Plus protects memory no matter what lighting conditions. It is extremely versatile, and can be used in courses ranging from basic pre-algebra to calculus, and also has applications in physics, engineering, biology and statistics. Power Source(s): Battery; Solar; Display Notation: Algebraic; Number of Display Digits: 10; Display Characters x Display Lines: 10 x 2.