Introducing the NEWYES 991ES Scientific Calculator, a revolutionary tool that seamlessly integrates a scientific calculator with an LCD notepad. Designed with advanced functionality and convenience in mind, this calculator is perfect for students, engineers, teachers, and professional researchers. Key Features: Scientific Excellence:Combining the functionalities of a calculator and an LCD notepad, the NEWYES 991ES allows you to perform calculations and take notes simultaneously. The built-in stylus lets you jot down important points, and the delete button ensures you can clear your notes easily. Lock the screen to save your notes for future reference. Versatile Calculations: With 417 advanced functions, this calculator is more than just a basic scientific tool. It includes operations for integrals, derivatives, statistics, and complex number calculations, catering to both elementary users and math majors. Foldable & Portable Design: The innovative foldable design allows the calculator to be neatly stored, with the LCD doubling as a protective cover. Its compact size ensures it fits comfortably in your pocket, making it an ideal companion for on-the-go calculations. Dual Power Supply: The main screen is solar-powered, ensuring you never run out of power during crucial moments. Additionally, the LCD notepad is powered by a replaceable CR2032 button battery, included with your purchase. Superior Quality: Built to last, the NEWYES 991ES features premium plastic keys that are more sensitive and precise than traditional silicone keys. This ensures a smooth and accurate user experience. Specifications: - **Model:** 991ES- **LCD Display:** 6.5 inches- **Button Battery:** CR2032- **Calculate Functions:** 417 Functions- **Size:** 16.2cm x 1.75cm x 8.1cm Package Includes: - 1 x 991ES Scientific Calculator- 1 x Stylus Pen- 1 x Manual Upgrade your calculating experience with the NEWYES 991ES Scientific Calculator, where technology meets practicality.