Feature:1. Comprehensive Functionality: The TY-290ES-D scientific calculator boasts 240 built-in functions, in including algebra, geometry, triangle, calculus and more. It also supports complex number, matrix, and vector calculations, catering to a wide range of scientific and engineering needs.2. Dual-line LCD Display: Equipped with a dual-line LCD display, this calculator allows you to view both the equation and the result at the same time, making it easier to check and correct calculations. The clear and easy-to-read screen ensures high detail visibility.mathematical formulas, making complex calculations more intuitive.3. Dual Power Source: Operated by solar panel and 1*AAA 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: This calculator features large, clear numeric keys and a protective cover with an anti-collision design. This thoughtful design ensures durability and ease of use, making it a reliable 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 a great gift for those in need of a scientific calculator.Specification:Model: TY-290ES-DScreen: Dual Line display 10+2 digitsSize: 160x85x19mmWeight:125g Package List:1 x Calculator