Two-way Power Basic Calculator: Solar and battery, the calculator can be used without battery in sunlight or light (2 AA battery included and the other is a spare ). Large 12-Digit LCD Display: Specially modulated pigment for the display screen which improves the clarity of the display screen clearly. 10 Key Calculator Big Buttons: Computer keyboard type big keys easy to press with fingers. Calculators Large Display: 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. Basic Calculators: It's paperless calculator, perfects for office, business, school calculators for students, store, mall daily and office home used.it by user such as bank stuff, financial worker and data analyst etc.