12-Digit Arithmetic and Comfortable Design - Performs 12-digit calculations with a tall, thick tube body that is suitable for both desktop use and handheld operation. The buttons are comfortable, lightweight, and textured for easy typing. Solar Powered Charging - Solar powered for use anywhere and anytime, reducing the need for battery replacements. The calculator features a large button layout with a design that matches human habits and provides a comfortable touch. Easy to Carry - Portable and compact, ideal for students. Fits easily in a backpack or handbag and does not take up much space, with a practical pocket-size form factor. Scope of Application and Performance - Includes a variety of financial functions suitable for adults and students. The solar calculator is well suited for daily calculations in schools, homes, offices, and other work environments. It is designed for reliable, everyday use by teachers and office workers. Use scenarios - In class or study sessions: perform 12-digit calculations for math drills, budgeting practice, or financial exercises with easy-to-use buttons. - Office or classroom daily calculations: quick totals, discounts, taxes, and other financial functions for general office tasks and teaching demonstrations. - On the go or in fieldwork: solar-powered operation allows calculations away from power outlets, ensuring reliability in travel or remote work environments.