2-in-1 Scientific Calculator with LCD Writing Pad This innovative 2-in-1 device combines a scientific calculator with a reusable writing pad, boosting your study and work efficiency. The built-in pen on the back is conveniently attached, allowing you to calculate and record notes simultaneously. Supports calculations up to 10 digits, with clear and easy-to-read data, suitable for both beginners and advanced users. Reusable Writing Surface: Equipped with an ergonomic magnetic pen, write or draw clear lines. Simply press the erase button to instantly clear the screen and reuse it repeatedly, reducing paper waste and promoting environmental friendliness. Eco-Friendly and Eye-Caring: This 2-in-1 calculator is a sustainable alternative to paper notebooks. The LCD screen on both the calculator and writing pad emits no blue light, protecting your eyes. Quiet Operation: Made with high-quality, silent silicone buttons, this calculator provides a quiet and distraction-free experience, perfect for offices, classrooms, and other quiet environments. Powered by 2 button cell batteries (LR1120 and CR1220), no charging required (approx. 1-year battery life). Replaceable batteries. Portable and Convenient: The foldable clamshell design allows for easy portability. Simply close the cover and slip it into your pocket or bag, making it ideal for work, study, or everyday use.