The huge LCD screen that clearly displays big numbers makes it easy to read from afar, and it s aesthetically pleasing. Your calculation process will be faster and smoother with this calculator s responsive buttons. Once pressed, the buttons quickly register and display the corresponding number on the screen. The big size of the buttons prevents you from hitting the wrong button. This calculator utilizes both the solar power and battery power battery included. The solar panel is the primary source of power, as long as you use it in a lit environment. This calculator utilizes both the solar power and battery power battery included. The solar panel is the primary source of power, as long as you use it in a lit environment. Add, subtract, multiply, divide, backspace, grand total, CE, , M /M/MRC, On/AC Button, and Auto PowerOff. The calculator will turn itself off after about 6 minutes of being idle.