Twoway Power Input This calculator operates using solar power in bright environments and battery power when light is limited. You can continue working without interruption by switching to a welllit area when the battery is low. Ideal for consistent performance in both indoor and outdoor settings. Large Button Design Features oversized keys for comfortable and accurate input, making it easy to use for extended periods. The button design has been tested extensively for durability, ensuring smooth operation and a reliable feel over time. Suitable for office, school, or financial calculations where precision matters. Extralarge LCD Display Equipped with a clear, 4.2inch display that shows up to 12 digits at once. The large screen allows for quick, easy viewing of results without eye strain, making it convenient for fastpaced work and extended calculation sessions. Basic Fourfunction Operation Performs addition, subtraction, multiplication, and division with precision. These core functions are essential for general office work, classroom learning, household budgeting, and everyday numerical tasks. Practical Use Scenarios Office Work: Handle accounting entries, expense tracking, and calculations efficiently. School: Assist students with assignments, exams, and quick problem solving in math and science classes. Home: Manage household budgets, shopping totals, and finance planning with ease. Designed for dependable performance and ease of use, this calculator combines a dual power source, durable large buttons, a visibility display, and essential functions to meet the needs of professionals, students, and everyday users.