This add-on will record all failed log in attempts for the admin panel and display them. You can view them at Tools->Logs->Failed Acp Login Logs. The following things will be logged in there:
1) Name/Email Address
2) IP Address
The admin can set it so he/she can receive an email each time that a failed log in attempt for the admin panel will be recorded. That option can be enabled/disabled. It can be found at Acp->Options->Admin Control Panel.
If the option to enter the notification email will be sent to will be left blank then the default email that you have entered at Options->Email Options->Default Email will be used to receive the failed log in attempt for the admin panel.
To have a better idea as to how this mod looks like when being used, please have a look at the attached screenshots.