The CYBEX Eternis S with SensorSafe™ is the only car seat your child will need from birth and beyond. With three modes-rear-facing, forward-facing, and booster, this all-in-one convertible car seat is designed for use from birth up to 120 lbs. This car seat features an adjustable Linear Side-impact Protection (L.S.P. System), which absorbs up to 25% more impact forces in the event of a near side-impact collision* and a patented 3-position reclining headrest guides your child s head into a safe and comfortable position. With the addition of SensorSafe™ car seat safety technology, you'll gain instant insight into your child's well-being right to the SensorSafe app on your phone. These features, combined with a steel-reinforced frame for strength and durability provide advanced child safety protection and peace of mind.