The CYBEX Eternis S with Sensor Safe All-In-One Car Seat offers 10 years of use in one easy-to-use package - making it the only car seat your child will need, from birth and beyond. The Sensor Safe technology integrates important next-gen safety features into the chest clip of the car seat to alert you when unsafe situations arise. The Eternis S offers an adjustable Linear Side-impact Protection (L. S. P. System), which absorbs up to 25% more impact forces in the event of a side impact collision and a patented 3-position reclining headrest, which helps prevent the child's head from falling forward while asleep, guiding the head and neck into a safe position. These features, combined with a steel reinforced frame for strength and durability provide advanced child safety protection and peace of mind. Suitable from 4 lbs. up to 120 lbs., the Eternis S offers 3 stages of protection - as a rear-facing infant seat up to 50 lbs., a forward facing convertible seat and then as a belt-positioning booster that lasts through your child's first 10 years of age. SensorSafe is compatible with most vehicles 2008 or newer with an OBD II port. For some electric vehicles, contact Cybex as an additional adapter may be needed.