This scientific calculator with 4-line alphanumeric natural textbook expression display has over 400 functions to help tackle even the most difficult math or science challenges. The natural textbook displays shows formulas and results as they appear in textbooks, eliminating any ambiguity and doubt while tackling complicated calculations. The calculator, with hard protective case, runs on solar power with battery backup, saving energy and money with minimal battery usage.Datexx's scientific calculator series provides the heavy-duty functionalities needed while incorporating added benefits and features to make the calculators user-friendly. Not only do Datexx's scientific calculators offer the same or even more features than comparable offerings on the market, but also have better price points and usability. It's a no brainer choice all around for students and professionals.