【552 Calculation Functions】Scientific calculators 991ex features 552 functions, including spreadsheet, exponential, matrix calculation, statistics, integration, algebra, complex number calculation, standard deviation, and more, suitable for handling complex equations and statistical data. From beginner to advanced courses, its practicality can meet the needs of various digital fields. 【High Resolution & Multi-line Display】991ex scientific calculator is equipped with a high-resolution multi-line display that supports natural display of mathematical formulas and fractions, presenting expressions intuitively and showing the calculation process and results simultaneously. Adjust the screen contrast according to your preference for a clear and comfortable experience. 【High-Efficiency Calculator】Scientific calculators has an integrated spreadsheet mode that supports data input and formula calculation; advanced operations such as 4×4 matrix and vector operations, with a quad-core processor to enhance calculation speed, making it faster to solve high-order equations and perform matrix operations, meeting the needs of efficient calculation. 【Long Battery Life & Durable】Fraction calculator has a dual power system of solar and button battery for long-lasting operation. It automatically shuts down after 8 minutes of inactivity. Sliding back cover protects the calculator body, making it pressure-resistant and durable, meeting the needs of high-intensity study and outdoor use, providing peace of mind in exam scenarios. 【Ultra-light & Portable】Advanced scientific calculators is designed to be lightweight (about 125g), suitable for carrying around. The button layout is clear, and the anti-slip material enhances the operation feel. It has various function keys to simplify complex calculations, including a "CHG" button for switching between fractions and decimals, making precise value calculations easy. Are you looking for a scientific calculators that can keep up with your learning pace? The DUPOTA 991EX PLUS is your ideal choice, combining advanced math functions with daily usability. This is a device that supports both solar and button battery power supply methods. Powered by solar panels when there is enough light, energy saving; while when there is insufficient light or long-term use, the button battery ensures that you can continue computing without worrying about power issues. With 552 functions, 10+2 digits and a 2-line display, they are perfect for any set of geometric figures, making mathematical equations easily applicable in education, the workplace and the home. The function calculator is equipped with a high-definition LCD display to ensure that the numbers are clear and easy to read. Even if the light is low, you can easily identify the calculation results, making it more convenient for you to use. In addition to basic calculation functions, this scientific calculator also has some smart functions, such as automatic storage, memory functions, etc. Make your calculation process more convenient and efficient. DUPOTA 991EX PLUS ll scientific calculator has become an indispensable tool in study, work and research with its excellent performance, rich functions and excellent quality. No matter what scenario you are in, it can provide you with accurate and fast calculation support. Come to Amazon to buy it and let DUPOTA 991EX PLUS ll become your right assistant in study, work and research!