Feature: 1. [Big Buttons] This calculator features large crystal 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. [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. 4. [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. 5. [Portable And Convenient] Its compact design makes the ECO-003 an ideal travel companion. Lightweight and easy to carry, you can take it with you to work, school, or anywhere you need to perform calculations. Specification: Model: ECO-003 Size: 19.8x15.5cm Weight: 133g Screen: 12 digits Battery: 1*AAA(not included) , solar panel Color: Grey Key: Crystal Key Package List: 1 x Calculator