Building on previously developed VitaSense technology, IEE has developed a single sensor, which is integrated behind the headliner of the vehicle, and can serve multiple detection purposes. The new low-power 79 GHz RF sensing unit is used as Occupant Detection Sensor (ODS) while driving, and makes this information available to the vehicle, as input for advanced seat belt reminder (SBR) systems. After the drive, the sensor keeps operating, and can thus detect left-behind occupants, including sleeping new-born children. The standalone sensor is hence capable to address two different functionalities playing a role in the Euro NCAP star rating. Advanced rear seat SBR is incentivised since 2018, and "Child Presence Detection" will become part of the rating scheme in 2022. As "VitaSense+ODS", the sensor addresses two rear seat safety issues:​ a) seat belt usage in the rear seats tends to be at least 10-15% lower than in the front seats, in some regions of the world even significantly worse;​ b) in- vehicle heatstroke of unattended infants and children in cars, which in 2018 reached a new record in the US with 51 resulting fatalities. Based on the driving tests performed, and static child detection tests, the 79 GHz RF sensing method has been found to be robust. It is important to note that the system presented serves as a reminder, which does not ensure the prevention of rear occupant injury or heatstroke fatalities per se.