[Calculator with Writing ]This calculator is combine with LCD writing board. With the stylus pen behind of the writing board, you can calculate and record it very easily. This desktop calculator supports calculations with up to 10-digits, the data is clear and easy to read, suitable advanced and beginners.[Eco-friendly]With this 2-in1 Scientific Calculator, you can calculate and record at any time, you also can put it as a notepad when you are not using the calculator. The calculators has a button, you can click this erase button to clear the full screen, write repeatedly, reducing paper consumption and being eco-friendly.[Portable to Carry]This handwriting calculators is lightweight and clamshell design, easy to carry. You can take it in your bag, pocket, or even purse, the perfect for office business, classroom, and home use.[Easy to Replace Battery]Built in 2 button batteries, 1PCS LR1120 battery for Calculator, 1PCS CR1220 battery for LCD Writing , you can be replaced any time without screw installation, don't worry about the battery dying anymore.[Mute Design]Our calculator's keyboard're made of silicone material, soft Contact keys, quiet and noise-free. With this calculator, you will not interfere with other people while calculating the data, Perfect for working and learning.colour: blackMaterial: ABSPackage Contents:1 set x engineering calculatorOnly the above package content, other products are not included.Note: Light 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.