150 steps check: Displays up to 150 previous calculation steps. Localized number display: Displays the number of four-digit separator format. Extra large display: The display can be easily read even more data to large. Two won power supply (solar + battery): If there is enough light, supply the solar power and has a battery power supply if there is insufficient light. Key Rollover: Since the key operation is stored in the buffer will not be lost even during high-speed input. Fixed Percentage: Fixed Percentage Calculation Operation instruction code: Mnemonic display indicates the status of the operations currently performed.CASIO