Dual Power Supply: The desktop calculator is powered by dual power sources of solar panels and AA batteries (1 AA battery included), with a long service life and is not affected by power outages during use. (Note: Some users may use the calculator in the early morning or at night. Without battery power, the screen may be difficult to read in low light. Please insert our AA batteries to ensure continuous and accurate use.) Responsive large buttons: The large calculator has large environmentally friendly plastic keys, which are more suitable for fingers, comfortable to touch, and quick to respond. Comfortable angle and large display: The calculator adopts a raised design to make the display angle of the screen conform to people's vision habits. The screen adopts a 12-digit LCD display, which makes it easy to clearly view the screen content. Four-point non-slip base The bottom of this basic calculator adopts a four-point silicone non-slip pad, which makes the calculator stand stably on the table, stable operation and not easy to slip. Suitable for a variety of people This basic desktop calculator is designed for a wide range of applications: desktop office, financial calculations, supermarket calculations, family budgets, student calculations, etc., to improve efficiency and accuracy.