Rechargeable 991ES Black Calculator with Notepad for Students

【417 Computing Functions】 - Calculation Capabilities: Utilize our calculator for advanced functions including CALC, SOLVE, BASE-N, EQN, MATRIX, TABLE, VECTOR, fractions, variable statistics, complex number calculations, linear regression, base arithmetic, and computer science. - Comprehensive Statistics: Perform standard deviation computations and polar-rectangular conversions effortlessly. - User-Friendly Interface: The powerful yet intuitive interface allows for a seamless user experience.

【Power Options】 - Rechargeable & Solar Power: Equipped with a built-in rechargeable battery and solar power support, ensuring continuous operation without the need for frequent replacements. - Included Charging Cable: Comes with a charging cable for convenient use.

【Natural Writing Function】 - Natural Input and Output: Input and output content in a writing format, making it easy to read and understand. Additionally, handle tabular statistics effortlessly.

【Display】 - 4-Line Display: Feature a 4-line display capable of showing 199 characters at once, making it easy to enter and calculate large data sets. Simultaneously display both the entry and calculated results for convenience.

【Notepad Integration】 - Comprehensive Notepad: Includes a 6.5-inch writing tablet and a pen for taking notes during calculations. Use the DELETE button to erase notes or lock the notepad for security using the LOCK KEY.