The solution is so close. Do you often have to perform complex calculations and invoicing in the office? Save time and calculate flawlessly with the professional device from Texas Instruments. The technical-scientific calculator provides significant relief when it comes to accurate mathematics. Its many extra functions are easy to use and ensure precise calculations. The model can display a full 64 digits, allowing you to keep track even with long calculations. Additionally, the four lines of the display also assist in this. The model is powered by a clever combination of battery and solar energy, making it easy to use anywhere. If the battery does run out, a new CR2032 type battery is required. Batteries are already included in the package.