Redesigned ES PLUS series calculators featuring easy-to-understand Natural Textbook Display, Non-Programmable Scientific Calculator with 417 Functions Stylish design but same function as Casio FX-991ESPLUS 1st edition, 10-digit mantissa + 2-digit exponential display Basic Trigonometrical & Statistics Functions, and many more functions Colour coded keypad for easy key differentiation, Simple and easy to use, Comes with new slide on hard case.