The calculator is solar powered and uses a single AAA battery so it can operate in low light conditions. Automatic shutdown after 8 minutes of no other operations. The 12-digit calculator has an LCD display that is tilted at a fixed 30-degree angle to fit your display just right and is much clearer than a straight display. Large, independent buttons make each press more accurate. Pressing the big keys is like pressing them on a computer keyboard. Large display and keys, with rounding function, with backspace and memory function, this extra large display calculator is especially suitable. Features:Dimensions: 6.69 x 6.69 x 1.57 inchesWeight: 9.9 ozMaterial: ABS engineering plasticBattery type: AAA battery (battery not included)12 bitsOffice Desktop Calculatorlarge displayhigh feedback buttonElectricity and Solar Desktop calculators have basic arithmetic and storage functions for all four functions, plus arithmetic roots, addition and subtraction conversion, rounding keys, unconditional carry and rounding and decimal selection keys.This desktop calculator has a large LCD display that is easy to read and bright enough. 12-bit characters are displayed in sharp, dark fonts with excellent contrast. The ergonomically designed touch buttons make the calculation process faster and smoother; when pressed, the buttons respond quickly and display the corresponding numbers on the screen; ABS plastic knobs not only make the calculation feel comfortable when using the device, but also With high rebound button design. With solar and battery powered systems, it can be fully powered in any bright environment without worrying about running out of power. The working time is very long, and it will automatically shut down if it is not used for 8 minutes. It is very smart. Occasion: Large desktop calculator, ideal for daily use in home, office, company, school, shop, shopping mall, etc. It is also widely used by bankers, financial workers, data analysts and other users