ROA system (Rear occupant alert system) detects rear seats with ultrasonic sensor to check if there is any kids left. If the movement of a kid is detected by the system, the alarm will be turned on to remind the driver.
Open type ultrasonic sensor
ROA system uses open type ultrasonic sensor. The product is installed on the top of vehicle, and detects moving objects with ultrasonic range detection principle.
When the open type sensor detects the moving object at the vehicle rear seats, the alarm will be turned on to remind the driver.