150 Steps Check: Displays up to 150 previous calculation steps Localized Number Display: Displays numbers in three digit separator formats (Standard, European and Indian) Extra Large Display: Larger display makes more data easier to read Two-Way Power (Solar + Battery): Solar powered when light is sufficient, battery powered when light is insufficient Key Rollover: Key operations are stored in a buffer, so nothing is lost even during high-speed input Plastic Keys: Designed and engineered for easy operation