3 In 1 Design: The solar calculator includes a notepad and a stylus. You can take notes while calculating without paper, which helps improve learning and work efficiency, saves time, and offers added convenience. 12-Digit Display: This calculator supports both battery and solar power, providing dual power options for extended use. It features a 12-digit display and an LCD writing board. Portable & Slim: This upgraded calculator is slim and lightweight (only 4.05 oz). The folded design protects the writing surface and makes it easy to carry. It can be stored in schoolbags, briefcases, pockets, and more. Mute & One-key Erase: This calculator uses silicone buttons for quiet operation. A dedicated button at the bottom of the writing tablet allows for quick screen clearing. Multi-Use Calculator: This device functions as a calculator and can also be used for drawing and writing practice. It is simple to use and suitable for students, teachers, and business professionals. Color: Black Material: ABS Size: 160 x 78 x 12mm Package Contents: 1 x Calculator With Notepad 1 x English Manual Note: Light reflection and differences in display screens may cause slight variations in color. Measurement may vary by +/- 1-3cm.