Fangrui Product Details 1. Osalo 240 Functions Lcd Screen Solar Dual Power Supply Plug-in Teaching Calculator 2. Material: Abs, Electronic Components 3. Features: Large Screen Display, 12 Digits, Dual Power Supply, Large Buttons 4. Display Digits: 12 5. Built-in Solar Battery: 200mah Battery 6. Battery: L1131f Button Battery X 1 (battery Included In Delivery) 7. The Key Numbers Are Made Of German Ink, Which Is Durable 8. Fast Ic, Fast Computing Speed, Low Energy Consumption 9. Good Photoelectric Conversion Efficiency, Can Provide Sufficient Power, More Convenient To Use 10. High-definition Lcd Display, Clear Display 11. With Anti-slip Pad On The Back, Stable Placement 12. Product Size: 16.5 X 8.4 X 1.17 Cm 13. Net Weight: 115 Grams Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.