This medium-sized calculator offers a range of features suitable for various settings. Here are some details about its functionality: Key Features: 12-Digit Display: This calculator has a 12-digit display, making it suitable for various accounting functions. Large Buttons: The calculator is designed with large summarys that are not easily pressed by mistake, ensuring accurate input. Dual Power Supply: It can be powered by either a solar panel or an AA battery, providing you with two power supply options. Applications: The calculator is versatile and can be used in various settings, including home, office, school, engineering, and finance. Dual Power Supply: The calculator features both solar power and an AA battery slot. The AA battery ensures that the calculator functions even in low light or when solar energy is insufficient. (Please note that batteries are not included and must be purchased separately.) Initial Use: When you first receive the calculator, it may appear blurry, and the stored solar energy might not be sufficient. This is normal. Recommendations for First Use: To ensure optimal performance, it's recommended to place the calculator in a sunny or well-lit area initially to absorb some solar energy. Alternatively, you can install AA batteries to ensure the calculator operates smoothly. Battery Use: If you choose to use AA batteries, make sure to check the battery orientation to ensure that the calculator functions properly. If the calculator does not work as expected, try replacing the battery with a new one. Product Size: The calculator's dimensions are 7.5 inches x 6 inches x 1.5 inches. Package Contents: The package includes one desktop calculator. This calculator is a practical tool suitable for a wide range of applications, offering the convenience of dual power supply options and large, easy-to-use summarys. For return inquiries or questions about orders please email us at [email protected] or message us directly.