OSALO Scientific Calculator 417 Function 10+2 Digits Written Display Solar and Battery Calculator Protective Case for School Black (OS 991ES Plus 2nd Edition)

"【417 Functions Scientific Calculator】With 417 functions for fractions, exponents, matrix calculations, statistics, integrals, algebra, calculations with complex numbers, standard deviation, solving variables, permutations and combinations, and linear regression, Scientific Calculator covers most scientific functions that students from middle school to college need for their courses and exams. The included user manual will help you find and use these functions. 【Scientific Calculator with Written Display】Enter expressions and arithmetic operations in the written form as in the textbook, which is easier to read than traditional calculators. The 2-line display shows both the input and the calculation results, allowing students to check the calculation process and results. 【Contrast Adjustment Function】The screen contrast can be adjusted with simple operation to achieve the best display effect, dimming to relieve the eyes, brightening to get clearer display results, and improve calculation performance. 【Electronic Two-Way Power Calculator】Solar and battery, double secure uninterrupted power supply, environmental protection and energy-saving benefits. 【Ultralight and Portable】Weight: 5.1oz. (145g); Size: 164 x 80 x 17 (mm) / 6.4 x 3.15 x 0.67 (inch); Material: ABS plastic. With slide-on hardshell case, convenient to carry and hold with one hand."