As we reported before, Tesla has added a new security feature to its cars called Sentry Mode. Sentry Mode uses the car's cameras to monitor its environment to detect potential threats. It will display a message on the touchscreen and record the encounter if the threat is minimal. But if it determines that the threat is severe, Sentry Mode will perform the same actions, but also play loud music through the car's stereo system and sound an alarm. Tesla has released a video of the security system in action. If a car switches to "Alarm" state, owners will also receive an alert from their Tesla mobile app notifying them that an incident has occurred. They'll be able to download a video recording of an incident (which begins 10 minutes prior to the time a threat was detected) by inserting a formatted USB drive into their car before they enable Sentry Mode.