MODEL- OH65 DESC.- CASIO INC. Accessory FEATURES- Overhead Projectable Calculator * Overhead calculator which emulates the Casio FX65. * This calculator has true fraction display that shows numerator over denominator. * Includes trigonometric and scientific functions * Random number generator * Two programmable constant functions to simplify repetitive calculations * Pi displayed symbolically in fractions * Simplification key to reduce fractions * Backspace * Algebraic logic * Percent * Square root * Pi * x * Powers of 10 * Exchange values * Exchange value with memory and more. * Teachers can receive this item free from Casio with the purchase of 90 FX65 calculators.