Two way power: Solar and battery-powered DC 1.5V?1x L1131 Alkaline button cell Large, angled 35° LCD screen with high contrast 64 x 20mm Classic design Comfortable shaped plastic keys Grand total, Double zero, square root and percentage calculation 3-button memory function 8min Auto Power-Off function Dimensions: 86 x 122 x 20mm Weight: ± 64g Color: black/white