Scientific calculator and notepad are designed as one, you can take notes while calculating, study and work efficiency. It is a great school supplies for beginners and teachers. It's a lightweight calculator with a writing pad, foldable design, and weighs only 4 ounces. It's so small you can put it in your pocket, take it out quickly when you need it and it right , convenient for taking notes calls and quick notes on your phone. Rewriteable, reducing paper consumption and environmental protection, no need to a shredder to dispose of paper. Quiet Design: Using high-quality silicone , feel comfortable, suitable for daily computing. The mute button does not disturb others, suitable for office, study and various usage scenarios. Colour: Black Material: plastic + silicone Package Contents: 1 x Scientific Calculators 1 x pen Only 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.