Scientific calculator with notepad: The scientific calculator and notepad are designed in one piece. You can take notes during calculations to improve study and work efficiency. This engineering scientific calculator supports 10-digit calculations, and the notepad can be used as a cover to protect the calculator from dust. the transparent button to erase the notes and protect personal privacy. and portable: This is a calculator with a writing tablet, foldable design, and weighs only 4 ounces (about 113.4 grams). Very compact, you can put it in your pocket, take it out and use it quickly if necessary, which is convenient for taking notes and quick notes on the phone. Health and environmental protection: The blue light-free LCD screen is used to protect your eyes. When you are not using a calculator, you can also put it on the table as a notepad. Can write repeatedly, reduce paper consumption, environmental protection, no need to use shredder to dispose of paper. Mute design: high-quality silicone buttons are used, which is comfortable to the and suitable for daily calculations. The mute button not disturb others, suitable for office, study and usage scenarios. product description Engineering Scientific calculator with 10-digit LCD display and 6-inch office writing tablet Product parameter Working temperature: -10 Fahrenheit - 40 Fahrenheit Writing strength: 5-10 ounces Battery model: CR1220*1, CR1120*1 Writing Baord Life Service: more than 50,000 times Troubleshooting Colour:black Material:ABS Package Contents: 1 * scientific calculators Only 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.