【401 Functions Scientific Calculator】With 401 functions for fractions, matrix calculations, statistics, calculus, complex number calculations, equation calculation, standard deviation, vector calculation, permutations and combinations, Scientific Calculator covers most of the scientific functions that students from middle school through college will need to use in their courses and on exams. Reading instruction attached will help you know how to use and find these functions. 【Brightness Adjustment Function】The screen brightness can be adjusted by simple operation to get the best display effect, dimming to relieve eye fatigue, brightening to get clearer display results, to improve the calculation efficiency. 【2-Line Scientific Calculator】Input expressions and arithmetic operations is more easy to read than traditional calculators. The 2 line display shows both input and calculation results,convenient for students to check the calculation process and results. 【Dual Power Source Electronic Calculator】Solar and battery,double safe uninterruptible power,environmental protection and energy saving advantages. 【Ultra-light & Portable】Weight: 4.97oz. (141g); Size: 164 x 80 x 17(mm)/6.4 x 3.15 x 0.6 7(inch); Material: ABS plastic. With slide-on hard case, convenient to carry it outside and hold it on one hand. Multiple Applications The scientific calculator has 401 functions, supports basic calculations, memory calculations (answer/continuous/independent/variable/formula storage and repeated calculations), scientific function calculations (sin, cos, tan & inverse /cot, sec /hyperbolic & inverse / Log to base /√, x√, 3√, x², x³, x(-1), X!, Angle unit conversion /Coordinate conversion/random number), statistical calculation (standard deviation/regression calculation/linear regression). Extra large display 12-digit LCD large display. The 2-line display shows the input and results at the same time. Work efficiently and error-free. Dual power supply Solar and battery, long service life, very small touch with the outside world, no need to replace it for a long time. Ergonomically touch keys The buttons are ergonomically shaped and confígured to match natural finger movement plastic soft and durable. With protective case A sturdy sliding protective case covers both sides of the calculator. Protect buttons and device body. Easy to carry.