SainSmart Vecus V1 Professional Scientific Engineering Calculator Blue Developed especially for the students, teachers and engineers who major in Advanced Mathematics, Geometry, Algebra, Trigonometry, Statistics, Calculus, Biology, etc. 417 Functions, 47 Keys, 8 Calculation Mode, contain most complex calculations of Advanced Mathematics such as Complex Number/ Statistical/ Base-n/ Equation/ Matrix/ Number Table/ Vector. 14 Calculator Setup to specify your own calculator such as contrast, number of digits and different expression to display results, etc. Plastic keys, STAT-data based editor , multi-replay function, natural textbook display , sliding hard cover and two-way power (Solar + Battery). Comes with detailed instruction to every function and calculation and 1-year limited warranty from SainSmart.