1.Large Display & Pushbutton Calculator: Place the calculator on your desktop and the large 30° display is right across the line of sight, much clearer than a straight screen. The large, separated buttons make every press more 2.12-Digit Basic Calculator: extra-large screen and buttons with round function, backspace, and memory, this extra-large display calculator is especially suitable for seniors, accountants, salespeople, or other businesspeople working in offices, stores, markets, and more. 12 digits and 00 buttons for large number calculations 3.Large Responsive Buttons: Spring loaded ergonomic design simulates the feel of a mechanical keyboard with fast key response. These buttons are responsive and can be pressed easily without misuse or keystrokes. It is a combination of modern technology and classic charm. 4.Dual power supply: Powered by one AA battery and solar panel. Please note that one AA battery is included in the package. The solar panel can only be used as an auxiliary power source. It is highly recommended to put one AA battery for a clearer display. 5.MULTIFUNCTIONAL CALCULATOR: Four-function calculator with addition, subtraction, multiplication, division, backspace, total, CE, %, M+/M-/MRC and auto shut-off functions, perfect for office, elementary school, market or even home use.