CASIO JS-40B Heavy Duty 14 digits calculators deliver outstanding durability and ultimate usability. The square ingot body exudes a powerful presence and the chic metallic colours impart a sense of sophistication and high quality perfectly suited to state-of-the-art CASIO calculators. Durable Anti-fade Keys: Keys are produced by injecting plastic of two different colors and key markings are plastic, which do not wear or fade with use. Solar & Battery: Solar powered when light is sufficient, battery powered when light is insufficient. Non-slip Structure: Large rubber feet on the bottom of the calculator keep it from slipping during operation. Function Command Signs: A symbol (+,−,×,÷) on the display indicates the status of the operation you are currently performing. Silent Touch Keys: Keys are specially designed for silent operation when compared to previous CASIO calculators to help maintain a more pleasant working environment. Three-Key Rollover: Key operations are stored in a buffer, so that nothing is lost even during high-speed input.