Scientific Calculator with Notepad: Comes with a 6.5-inch writing pad and stylus, allowing you to take notes while calculating. You can press the erase button to clear notes and also lock it to preserve them. 417 Calculation Functions: Includes CALC, SOLVE, Base-N, EQN, MATRIX, TABLE, VECTOR, fractions, variable statistics, complex number calculations, linear regression, base arithmetic, data science, standard deviation, and polar-rectangular conversions, etc. More Sensitive Keypad: Utilizes premium plastic material keys, making it more responsive and accurate than silicone keys. Comfortable to the touch. Solar Powered: Solar panel + replaceable button battery for smooth operation and long battery life. Foldable & Portable: The NEWYES calculator notepad is foldable, closes to protect against dust, easy to store, and easy to carry. Perfect for elementary and high school students, college students, and professional researchers.