The add-on automatically adds aStage Tracking tab to your Opportunity Details window.
It can display the Process and Stage name, the Stage Start Date, the number of days the opportunity stayed at the stage and the user who set the stage.
If alerts have been set, it displays an icon on the tab (see (1) in the screenshot below) and colorizes the current stage Days columns according to the alert (3). An icon also identifies the current stage (2).
You can edit and delete history records. By default, only database administrators have the ability to do this, but you can change this setting under Options > Preferences.