Set email notification on your Facebook login
Facebook has a feature where you can set email or text notification when you login to your Facebook account from an unknown device. This feature was used to prevent hacking attempts and notify account owner about suspicious login from unknown devices.
To enable this feature just go to Security settings.
Under security settings section you can see login notification section. When you click on it you will see two options.
(2) Text message/Push notification
If you want be notified through email when you login then select email option. Now you will get email when you login from an unrecognized device.