The calculator is solar powered and uses one AAA battery, so it can operate in low light s. Auto power off in 8 minutes if no other operation. The 12-digit calculator has an LCD display that's tilted at a fixed 30-degree angle for clearer visibility. Large and separate buttons make each press more accurate, similar to pressing computer keyboards. With a large display and keys, rounding function, backspace key, and memory function, this calculator is particularly suitable for various uses. **Feature:** Size: 6.69 x 6.69 x 1.57 inches Weight: 9.9 ounces Material: ABS engineering plastic Battery type: AAA battery 12-digit Office Desktop Calculator Large display High feedback buttons Electric and solar power The desktop calculator has basic arithmetic functions and storage functions for all four operations, as well as arithmetic roots, addition and subtraction conversion, rounding keys, unal carry keys, and decimal place selection keys. This desktop calculator has a large LCD display that is easy to read and sufficiently bright. The 12-digit characters are displayed in clear, dark fonts with good contrast. Ergonomically designed touch buttons make the calculation process faster and smoother; after pressing, the button responds quickly and displays the corresponding number on the screen. The ABS plastic knob provides a comfortable feel during use, with a high-rebound button design. Under the solar and battery power supply system, it can be fully powered in any bright environment without worrying about insufficient power. The working time is very long, and it will shut down automatically when not used for 8 minutes. **Occasion:** Large desktop calculator, suitable for daily use in homes, offices, companies, schools, shops, shopping malls, and other occasions. It is also widely used by bank workers, financial workers, and data analysts.