Calculator with LCD Writing TabletCome with a 6.5 inch writing tablet and a pen, which allows you to take notes while calculating. You can press the delete button to erase the notes, and you can also lock it to keep it. [Useful Functions] - Grand Total or Markup or Memory Clear and Recall or Memory function keys Add or Subtract make basic and complex calculations easy. [Versatile Functions] This calculator is designed for many occasions: business, office, home, basic budget, school, etc. Use it to help with your personal finances or just for a quick calculation session. [Responsive and Large Buttons] Your calculation process will be faster and smoother with the responsive buttons of this calculator. Once pressed, the buttons register quickly and display the corresponding number on the screen. Large button size saves you from pressing the wrong button. Solor EnergySolar panel and replaceable button cell for smooth testing and long battery life.