Features : This calculator has a input mode of engineering calculator and is only on general calculator functions in functional. Calculator functions as follows: 1. General calculation of Math. 2. Has parentheses priority function. (The parentheses need in pairs that allow to press operation of equal sign button.). 3. M +, M -,% , etc ..., and functions of general calculator. 4.The calculator screen will enter excessive Long formula that can scroll rollers by hand, and continue to enter infinit