The programmable calculator performs standard operations: addition, multiplication, subtraction, and division for a limit of 15 digit numerals. The standard order of operations is used.

[ Unique features]

1:- One of the unique features is the < = > button which allows you to define your own expression for evaluation.

2:- allows the user to find and redo a recent calculation.

Use the below link for more information.
https://www.zimbaroos.in/Calculator/HelpPage.html