The OREVA OR-1312-C is a basic calculator featuring a 12-digit display, making it suitable for standard arithmetic operations. It offers a 120-step check and correct function, allowing users to review and amend up to 120 previous entries, thereby reducing errors. The calculator is powered by both solar energy and a battery, ensuring continuous operation under various lighting conditions. Additionally, it includes an auto replay function, enabling users to revisit calculation steps for verification purposes. These features make the OR-1312-C a reliable tool for everyday mathematical tasks.