The solution is so close. Do you often have to deal with complicated invoices and calculations at the office? Save time and calculate accurately with the professional device from Texas Instruments. The scientific calculator provides significant relief when it comes to precise mathematics. Its many extra functions are easy to use and ensure accurate calculations. The model can display a full 64 digits, allowing you to keep track even with lengthy calculations. Additionally, the four lines of the display also help with 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 needed. The batteries are already included in the package.