Feature: 1. [Big Buttons] This calculator features large keys that provide a comfortable and smooth typing experience, reducing the risk of errors during calculations. 2. [12-Digit Display] With its clear 12-digit screen display, you can perform large calculations easily, making it an ideal tool for office work, accounting or student use. 3. [Silent Keyboard] The keyboard design offers a tactile response for each keypress, which enhances the accuracy and speed of your calculations. 4. [Dual Power Sources] This scientific calculator operates on dual power sources - solar and 1 AAA battery (not included), ensuring continuous and reliable power supply for your calculations. 5. [Versatile Use] Whether it's for office work, accounting tasks or student homework, this calculator is designed to cater to a wide range of numerical computation needs, offering professional-grade reliability. Specification: Model: ECO-002 Size: 17.8x13.5cm Weight: 181g Screen: 12 digits Battery: 1*AAA(not included) , solar panel Package List: 1 x Calculator