Color Black Type Engineering/Scientific Calculator Power Source Battery Operated Material Silicone, Acrylonitrile Butadiene Styrene (ABS) LCD Display Type About This Item Calculator with Writing Tablet: - This calculator is combined with an LCD writing board. With the pen behind the writing board, you can calculate and save it very easily. This desktop calculator supports up to 10 digits calculations, the data is clear and easy to read, suitable for advanced and beginners. Environmentally friendly:- With this scientific calculator 2 in 1, you can calculate and save anytime, also you can put it as a notepad when you don't use the calculator. Calculators have a button, you can click this erase button to erase the full screen, write repeatedly, reduce paper consumption and be environmentally friendly. Portable to carry : - This handwriting calculator weighs only 120g, lightweight and clamshell, easy to carry. Product size: 160*78*12.8mm. You can take it in your bag, pocket or even your purse, great for office, classroom and home. Easy to replace battery:- Built-in 2 button batteries , 1 LR1120 battery for calculator, 1 CR1220 battery for LCD writing tablet, you can be replaced at any time without installing screws, no longer worry about the battery dying. Mute design : - Our calculator's keyboard is made of silicone, soft keys, quiet and noiseless. With this calculator you will not interfere with others when calculating data, ideal for working and learning.