Two-way Power Basic Calculator: Solar and battery, making it convenient to use in any lighting condition. (Provide 2 AA batteries, only 1 needed ). Large 12-Digit LCD Clear Display: Specially modulated pigment for the display screen which improves the clarity of the display screen clearly. 10 Key Calculator Easy-to-Use Big Buttons: Computer keyboard type big keys easy to press with fingers. Portable Design: Designed to sit flat on a desk, countertop, or table for convenient access, this calculator is easy to carry for quick and easy tax calculation Perfect for Business and Personal Use: This paperless calculator is perfect for use in the office, school, or at home. It's ideal for anyone who needs to make quick and accurate calculations, including bank staff, financial workers, and data analysts.