Mini desk type calculator designed and engineered for easy operation. The calculator features a 12-digit large display, 3-digit comma markers, and two-way power. Two-Way Power: Solar powered when light is sufficient and battery powered when light is insufficient. Extra Large Display: Larger display makes more data easier to read. Colour: Black Number of Digits: 12 digits Power Supply: Solar & Battery Memory: Independent memory Key Characteristics: Plastic keys