Color: Black Type: Scientific Calculator Power Supply: Battery Powered Material: Silicone, Acrylonitrile Butadiene Styrene (ABS) LCD Display Type Calculator with Writing Pad: This calculator is combined with an LCD writing tablet. With the pen attached to the back of the writing pad, you can calculate and save notes very easily. This desktop calculator supports calculations up to 10 digits, with clear and easy-to-read data, suitable for advanced users and beginners. Eco-Friendly: With this 2-in-1 scientific calculator, you can calculate and save notes anytime. You can also use it as a notepad when not using the calculator. The calculator has a one-button erase function; you can click the erase button to clear the entire screen, allowing for repeated use, reducing paper consumption, and being environmentally friendly. Portable to Carry: This handwritten calculator weighs only 120g, is lightweight, and foldable, making it easy to carry. Product size: 160*78*12.8mm. You can take it in your bag, pocket, or even your handbag, perfect for offices, classrooms, and homes. Easy Battery Replacement: Built-in 2 button batteries, 1 LR1120 battery for the calculator, 1 CR1220 battery for the LCD writing tablet. You can replace them anytime without installing screws, so no more worrying about the battery running out. Silent Design: Our calculator's keyboard is made of silicone with soft, quiet keys. With this calculator, you won't disturb others while calculating data, making it perfect for work and study.