1.Professional grade scientific calculator with 240 scientific functions. Easily handles 1 and 2 variable statistical calculations, three angle modes (degrees, radians, and grads), and scientific/engineering notation modes. 2.12-digit widescreen HD display. 2-line display shows inputs and results at the same time. Works efficiently and makes no mistake. 3.Meets the ergonomics design and offers a comfortable grip. Responsive buttons, clear numbers, and scratch-proof. 4.Solid sliding protective case covers either side of the calculator. Protects buttons and the device body. 5.Package includes: Scientific Calculator*1/2/3/4/6PCS, instructions. 2 LINE DISPLAY: Show entry and calculated result at the same time. The upper line for the formula, the lower line for the result. POWERFUL & MUILTFUNCTIONAL: Over 240 functions, including fractions, statistics, complex number calculations, base arithmetic, linear regression, standard deviation, computer science, and polar-rectangular conversions, thus could deal with the complex and complicated calculations problems in various fields. EFFICIENCY AND ACCURANCY: Ideal helper for middle/ high school students and Maths researchers and other professionals. Greatly improve efficiency and accuracy in work, statistics exercises and experiments. ERGONOMIC DESIGN: Ergonomically designed hard sliding cover can protects the calculator and also provide a comfortable grip.