The temperature inside the cabin of a closed car rises very high depending on the external environment. If those who cannot open the door by themselves - infants, children, pets, etc. - are left inside, it can cause major trouble. To prevent this, Hyundai Motor Group developed the world's first Rear Occupant Alert. The Rear Occupant Alert, first introduced through Hyundai Motor Company's 4th-generation Santa Fe, recognizes the presence of passengers in the back seat by whether the rear door is opened or not, and displays a rear seat confirmation notification on the instrument panel when the driver turns off the engine and opens the door. When the doors are locked, ultrasonic sensors mounted on the ceiling of the rear seats detect occupants for 24 hours. When motion is detected in the back seat, the emergency warning lights are activated for 25 seconds along with the horn, and text messages are sent to Blue Link subscribers. If the sensor continues to detect motion, it repeats the notification up to 8 times. Meanwhile, Hyundai Motor Group introduced a more evolved Rear Occupant Alert through the Genesis GV70. This system more precisely detects whether there are occupants in the vehicle through a high-precision radar sensor rather than an ultrasonic sensor.