Large LCD screen that displays large numbers clearly makes it easy to read from a distance, and it's aesthetically pleasing. Sensitive and large buttons: Your calculation process will be faster and smoother with responsive buttons of this calculator. Once pressed, the buttons register quickly and display the corresponding number on the screen. Large button size prevents you from hitting the wrong button. Dual Power Design: This calculator uses both solar and battery power (battery included). The solar panel, as long as you use it in a lighted environment, will power the calculator neatly. Versatile: This calculator is designed for many occasions: business, office, home, basic budget, school , etc. Use it to help with your personal finance or just for a quick math session. Features: Add, Subtract, Multiply, Divide, Roll Back, Grand Total, CE, %, M+/M-/ MRC, On/AC button, and auto power off. The calculator automatically turns off after approximately 6 minutes of inactivity.