With : There is designed with a sliding on the calculator, which prevents dust and dirt effectively, keeping the stationery and prolonging the service time Digital: This calculator displays 2 lines at a time, and a maximum of 12 digits can be displayed in each line, convenient for you to view the accounting process Application: This kind of scientific calculator can be used to account the function, easily handle 1 and 2 variable statistical calculations, three Angle modes (degrees, radians and grids) and scientific counting modes Battery operated: There are 2 types for choosing, the one has built-in button batteries(included), the other is powered by 2x AAA batteries(not included), you will receive one at random Wide use: This engineering calculating tool is designed with 240 kinds of functions, it is a good instrument for students and businessmen, you can order according to your needs