Multifunctional Student calculator: The school scientific calculator supports calculations with up to 10 digits, the data is clear and easy to read, and is suitable for advanced and beginners. Includes standard calculator and memory keys, square roots and percentages, labeled MU, covering basic calculations, scientific function calculations or other professional calculation functions. Reusable Notepad: The combination of a calculator and a writing board, with the touch pen fixed on one side of the board, can calculate and record at any time, effectively improving learning and work efficiency. The handwriting pad has an erase button. You can click this erase button to clear the entire screen, repeat writing, reduce paper consumption, and be environmentally friendly. Solar & Battery Dual Power Supply: The two button batteries can be replaced at any time without installation screws. The solar calculator on the left is powered by LR1120 batteries, or it can be powered by solar energy in a sunny environment, no need to worry about running out of batteries. (Note: The writing board on the right is only powered by CR1220 batteries.) Comfortable & Silent Buttons: The calculator features silicone buttons that are soft to the touch, quiet and noiseless. Noise-free while writing, which brings you a more comfortable touch feeling, suitable for office business, accounting calculations, student computing learning and various usage scenarios. Portable & Practical: The scientific function calculator is designed as a foldable clamshell type. The calculator's clamshell design can well protect the mechanical calculator keyboard and writing pad, making it easy to carry. Ideal for work business, engineering calculations, accounting calculations, student physics calculations, home use, etc. It is an ideal choice for junior high and high school students, college students and professional researchers.