Dual Power Design: The calculator is powered by solar energy or AA dry cell batteries. When there is sufficient light, it operates on solar power, and when the light is too dim, it immediately switches to battery power (to ensure the calculator functions). The calculator can be set to automatically shut off to conserve energy. (Battery not included in the package). Portable Mini Desktop Calculator: Simple design, high-quality construction, and durable. Calculator for seniors, accountants, salespeople, or other business professionals. Pack of 2 desktop calculators. Note: Leave it in the sun for 2-3 hours before first use or use the battery. Responsive Buttons: The generously sized buttons ensure your fingers are less likely to press the wrong number. The calculator buttons are made of easy-to-use and clean plastic material, comfortable to the touch, and responsive for calculations. The large buttons are easy to use and clean. Multifunctional: Use it in all possible situations. This calculator can speed up the processing of general mathematical calculations. Its functions include addition, subtraction, multiplication, division, CE, M+/M-/MRC, and ON/AC. It helps you avoid calculation errors, reduce mistakes, and increase your work efficiency. Large screen display: The calculator can display 12 numbers at an angle. The large LCD screen is located directly on the top of the calculator. It is very comfortable to use. The screen is clear and easy on the eyes. It is suitable for long-distance and nighttime reading without straining your eyes.