Come with a 6-inch writing and a pen, which allows you to take notes while calculating. You can press the delete button to erase the notes, and also can lock it to keep .240 Kinds of computing functions, Include fractions, statistics, complex number calculations, linear regression, arithmetic, computer science, standard deviation, -rectangular conversions, etc..Adopt silicone material key, comfortable to touch. supply mode: the calculator is charged by solar energy, and the is powered by button batterie.Calculator Notepad is foldable, closed to dust, easy to store, and easy to carry. perfect for & high school students, college students, and professional researchers.Color: BlackMaterial: ABS+SiliconeParameter:Product Name: Solar Scientific Calculator With Writing Material: ABS shell + silicone key supply mode: the calculator is charged by solar energy, and the is powered by button batteriesProduct folded size: 161 x 78mmProduct expansion size: 161 x 156mmPackage Contents:1 x Solar CalculatorOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.