The calculator is solar powered and uses one AAA battery, so it can operate in low light conditions. 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 that fits right into yours and is clearer than the straight display. Large and separate buttons make each press more accurate. Pressing the big keys is like pressing computer keyboards when you press them. With a large display and keys, with a rounding function, with a backspace key and with a memory function, this calculator with an extra large display is particularly suitable.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 functions as well as arithmetic roots, addition and subtraction conversion, rounding keys, unconditional carry keys & Rounding 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 and the contrast is very good. 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 does not just let the calculation press the hand feels comfortable when using the device, and it also has 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, which is very smart. Occasion: Large desktop calculator, very suitable for daily use in homes, offices, companies, schools, shops, shopping malls and other occasions. At the same time, it is also widely used by users such as bank workers, financial workers, and Data Analysts.