Feature: 1. Comprehensive Functionality: The scientific calculator boasts 552 built in functions, including trigonometric, exponential, logarithmic, calculus, statistics, algebra, and more. It also supports complex number, and vector calculations, catering to a wide range of scientific and engineering needs. 2. High Definition Display: Featuring a high definition display (192*63), this calculator ensures clear and easy reading. It supports display, allowing for the direct input and output of mathematical formulas, making complex calculations more intuitive. 3. Dual Power Source: Equipped with a solar panel and a battery, this calculator offers continuous operation in both indoor and outdoor environments. This dual power source design reduces the need for frequent battery replacements, making it an economical choice for long term use. 4. User Friendly Design: The calculator features large, clear numeric keys and a protective cover. This thoughtful design ensures durability and ease of use, making it a tool for frequent calculations. 5. Versatile Use: Ideal for students, teachers, engineers, accountants, and more, this calculator can meet various calculation needs in mathematics, science, and engineering. Its compact size and comprehensive functionality make it ideal for those in need of a scientific calculator. Specification: Model: TY -991EX Color: White Size: 165x80x15mm / 6.5x3.1x0.6in Weight: 125g Battery: LR44, 160MaH 1.5V. Package List: 1 x Calculator