Casio DS-1B Calculator
Key Features:

• Another step towards the ideal appearance: New models of HEAVY DUTY calculators that deliver outstanding durability and the ultimate in usability are now available. 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.
• Extra Large Display: Larger display makes more data easier to read.
• Durable Anti-fade keys: Keys are produced by injecting plastic of two different colours. Key markings are plastic, which means they do not wear or fade with use.
• Key Layout and Key Cap Shape: Keys are ergonomically shaped and configured to match natural finger movements.
• 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.