Battery Operated Mechanical Calculator: Mechanical calculator made of imitation ABS material with retro round keys with large buttons, pleasant to the touch, incorporating numerous design elements for ergonomic comfort and sophisticated aesthetics. (Provides 1 AAA batteries). Large 12-digit LCD display: Pigment specially modulated for the display screen, which improves the clarity of the screen. 10-key calculator with large buttons: The computer keyboard works well with large keys that are easy to press with your fingers and easy to read. Large calculator: Designed to lie flat on a desk, counter or table for convenient access, this calculator is easy to carry for quick and easy tax calculations. Basic desktop calculators: Perfect for use in the office, business, school for students, stores, daily shopping malls and home use. It is used by users such as banking staff, financial workers and data analysts etc.