The Tesla Model X has become the first SUV to receive a perfect safety rating from the National Highway Traffic Safety Administration (NHTSA.) SUVs are generally safer than cars due to their increased size, but a higher center of gravity causes the vehicles to rollover during tight maneuvering situations or a side impact accident. According to statistics, "rollovers happened in 1% of serious crashes in passenger vehicles but accounted for one-third of collision-related deaths." The Tesla Model X was designed to have a lower center of gravity due to its large battery pack located in the floor of the vehicle. This design choice, along with the larger front crumple zone, allowed the vehicle to receive a perfect rating from the NHTSA. In other Tesla news, Dog Mode has been enabled on Tesla vehicles. This displays a message on the screen in Tesla vehicles that shows the temperature of the car for passersby to know that they don't need to worry about the animals in the vehicle. Tesla also added a Sentry Mode to their cars. When customers enable Sentry Mode, the electric vehicle constantly monitors its environment from a "Standby" state like a home security system works. When the vehicle detects a break-in in progress, it will start recording the event with its cameras, sound the car alarm, blast loud music through the stereo system, and warn the owners of the incident via the Tesla mobile app on their phones. Video of the incident can be downloaded to a USB drive. If a minimal threat is detected, such as someone leaning on a car, Sentry Mode switches to an "Alert" state and displays a message on the touchscreen warning that its cameras are recording. If a more severe threat is detected, such as someone breaking a window, Sentry Mode switches to an "Alarm" state, which activates the car alarm, increases the brightness of the center display, and plays music at maximum volume from the car's audio system. 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.