Position 1: Flag staff is placed under the door hook...ready for the next mail delivery! Position 2: Postman opens and closes the mailbox door. Flag automatically springs up to signal "Y'all Got Mail!" Position 3: Flag is placed under the security hook. Flag will NOT spring up and door will still open & close. Great security feature while you're away! The Y'all Got Mail Alert only fits on standard METAL mailboxes. (Mailbox not included.)