[SCIENTIFIC CALCULATOR WITH GRAPHIC FUNCTION] - This is a scientific calculator that is able to show graphs of formulas. It features a screen large enough to be able to display graphs and equations simultaneously, allowing you to see calculations and corrections in high detail. Its 7 x 3.3 size ensures comfortable use. [MULTIPLE MODES] - This calculator features 3 operating modes: Angular Measurement, Calculation, and Display modes. More information is available in the photos. [OVER 280 FUNCTIONS] - Including fractions, statistics, complex number calculations, linear regression, standard deviation, permutations, and variable solving. Perfect for Advanced and Beginner courses including Pre-Algebra, Algebra I, Algebra II, Geometry, Trigonometry, Calculus, AP Calculus, AP Statistics, Biology, Chemistry, Physics, Finance & Business. If you are not able to turn on the calculator, please press the reset button on the back! If you still have any other issues, we offer a 365-day limited warranty. Please contact us and we will give you a response within 24 hours. PLEASE NOTE: This is a Scientific Calculator and not a Graphing Calculator. The graph functions help to visualize your formulas.