Ⅰ. Comprehensive Calculation Functions: Expand your computing with these calculators' 417 calculation functions; no problem is too complex for this scientific supply; a calculator with so many functions can help users solve almost any math equation, broadening their academic or professional. Ⅱ. DUAL : This calculator with notepad does not consume power, the calculator can use both replaceable coin cell batteries and solar energy; providing this feature ensures that the calculator will work properly in any situation; dual power supply The system's versatility ensures that your calculations are not interrupted, avoiding the loss of your work data and saving time. Ⅲ. Compact and Portable: With desktop dimensions of approximately 6.3 x 3.15 x 0.71 inches/16 x 8 x 1.8 cm, the calculator is designed to fit easily in your hand, in a small bag or desk drawer; its compact size ensures that whether you are a scientist, student or Anyone who often needs to perform complex calculations can accompany you. Ⅳ. Efficient and Clear Display: advantage from the clarity and efficiency provided by the LCD tablet on this college calculator; enough to display data clearly, yet compact enough to simplify , the LCD tablet ensures your calculations, formulas and results are easy to read and understand for maximum productivity; you can press the transparent button to erase LCD notes. Ⅴ. This black scientific calculator is a must-have for students, math teachers, and more; with 417 calculation functions, it's perfect for solving your needs , study, and the office. Ⅵ. The smart calculator is practical and portable, and can be stored in pockets and briefcases for easy use. Ⅶ. The school scientific calculator has an erasable LCD tablet that displays data clearly, giving you a good user experience. Ⅷ. Type:417 Functions Ⅸ. Colour:Black Ⅹ. Material:ABS Ⅺ. Size:Approximately 6.3 x 3.15 x 0.71 inches/16 x 8 x 1.8 cm Ⅻ. Package Contents: 1 * Solar Scientific Calculator XIII. Only the above package content, other products are not included. XIV. Note: Light reflection 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.