Features: 1.Solar Power - Adopting solar charging mode to prevent it from sudden power-off. 2.Precise Data - 12-bit ensures the high precision of data with no error. 3.Large Screen - A large screen displays data clearly. No detail missing. 4.Former Data Checking - Former calculated data can be checked again with some buttons. 5.Practical Equations Calculation - To calculate frequently-used logarithms for office, finance, etc. specification:This solar scientific calculator is capable of calculating frequently-used logarithms precisely and can work for a very long time through dual supplies of solar and battery. 12-bit enables it to calculate as precise as possible. Furthermore, large screen displays data clearly with no data missing. And former calculated data can be checked again with some buttons. Solar Power - Adopting solar charging mode to prevent it from sudden power-off. Precise Data - 12-bit ensures the high precision of data with no error. Large Screen - A large screen displays data clearly. No detail missing. Former Data Checking - Former calculated data can be checked again with some buttons. Practical Equations Calculation - To calculate frequently-used logarithms for office, finance, etc. Wide Compatibility - Suitable for office, finance, etc. : Product type: Solar Scientific Calculator Material: ABS Calculation: For frequently-used logarithms, etc. Charging mode: Solar charging Digit: 12-bit Former Data Checking: Support Large screen: Support Package size: approx. 13.5 * 13.5 * 2.5 cm/ 5.3 * 5.3 * 1.0 in Package weight: 127g/ 4.5oz Package List: 1 * Solar Scientific Calculator