12-digit calculator with dual powered solar and battery. Black rubber keys in ABS plastic white case with a detachable stylus pen. The writing board supports repeated writing which you can write and record information at any time without paper and ink. It is convenient practical and environmentally friendly. This calculator is an office essential. Since it is dual powered by a small solar panel and battery you always have a working tool at hand. Comes with instruction manual. NFC is available for add on.