Come with a 6-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 also can lock it to keep .240 Kinds of computing functions, Include fractions, statistics, complex number calculations, linear regression, base arithmetic, computer science, standard deviation, -rectangular conversions, etc..Adopt silicone material key, comfortable to touch.Power supply mode: the calculator is by solar energy, and the tablet is powered by button batterie.Calculator Notepad is foldable, closed to dust, easy to , 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 TabletMaterial: ABS shell + silicone keyPower supply mode: the calculator is by solar energy, and the tablet 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.