Cybex Eternis S SensorSafe All-in-One Car Seat

Cybex Eternis S SensorSafe All-in-One Car Seat

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CYBEX Eternis S convertible Car Seat with Sensorsafe

Eternis S All-In-One Car Seat

Usage 4 to 120lbs
Car Seat Weight 26 lbs
Max Child Height Up to 57"
Seat Dimensions H 25.5” x W 20” x D 25.3”
Included Accessories Cup holder, newborn inlay


The new CYBEX Eternis S with SensorSafe is the only 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. The Eternis S with SensorSafe integrates important safety technology into the chest clip of the car seat to alert when unsafe situations arise. The alerts are provided through a vehicle receiver and the caregiver’s smartphone. The Eternis S with SensorSafe alerts when the driver accidentally leaves the child behind secured in the car seat, a child unbuckles their chest clip while the vehicle is in motion, the back seat has become too warm or too cold and when a child has been seated for too long —all through a user-friendly app, that also provides guidance on installation, how-to videos, FAQ’s and more.

Additionally, the Eternis S with SensorSafe offers 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, 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.

  • Rear-facing from 4 lbs. to 50 lbs. Forward-facing from 22 lbs. to 65 lbs., Belt-positioning Booster from 40 lbs. to 120 lbs.
  • 5-point safety harness with SensorSafe Technology integrated in the chest clip (not used in Belt-positioning Booster mode)
  • Adjustable Linear Side-impact Protection (L.S.P. System) absorbs up to 25% more impact forces in the event of a near side impact collision* (*when compared to the same car seat without L.S.P. extended)
  • Patented 3-position reclining headrest helps prevent the child's head from falling forward while asleep, keeping the head and neck in a safe position and ensures a comfortable sleeping position
  • In-seat recline provides correct ergonomic positioning and extra legroom, allowing your child to safely ride rear-facing longer
  • 12-position, height-adjustable headrest with an integrated no-rethread harness for protection that grows with your child
  • 6-position one-hand adjustable recline for the best fit to your car
  • Magnetic buckle holders for easy entry and exit from the seat
  • Removable newborn inlay provides additional support for very small babies (4 lbs. to 11 lbs.)
  • Removable cup holder can be positioned on either side and is dishwasher safe for easy clean up
  • Cozy harness pads and 2-position padded buckle for comfort
  • Steel reinforced frame provides strength and durability
  • Energy absorbing shell and base help reduce the forces felt by the child in a collision
  • Dual Belt adjusters to ensure a tight fit
  • Dual-level indicators to help ensure the proper angle
  • Innovative one-pull LATCH removal system
  • LATCH Connection storage provided under the seat when not in use
  • Ergonomic design in CYBEX’s iconic Gold Design language
  • Designed and engineered in Germany

How SensorSafe Works:

Originally developed to help prevent the rising number of infant hot car deaths, SensorSafe will chime through the installed vehicle receiver to alert when a child is still secured in the back seat after the car has been switched off. This reminds the caregiver to act quickly, but if the child is still secured after several minutes an alert will be sent to the caregiver’s cellphone through the downloaded app. If the situation is still not remedied, the designated emergency contact will receive an alert with the GPS coordinates of the vehicle’s last known position. This state-of-the-art safety technology is designed so there is no need to reinstall each time you drive. For ease, just keep the receiver plugged into your car’s OBD port to drive with that extra peace of mind.

  • Chimes through the installed vehicle receiver if child is still secured in the seat when the car is switched off
  • Alerts through the caregiver’s cell phone if the child is left behind in the vehicle secured in the car seat and then alerts the designated emergency contact if the situation is still not remedied
  • Emergency contact receives GPS coordinates of the vehicle’s last known position
  • Alerts through the vehicle receiver and caregiver’s smart phone when the child has unbuckled their chest clip while the vehicle is in motion
  • Monitors the back seat temperature to alert through the vehicle receiver and the caregiver’s smart phone when the back seat appears to be too hot or too cold for the child’s comfort
  • Provides warnings to the caregiver when the child may have been seated for too long and needs a break
  • Receiver plugs directly into your car’s OBD port and syncs with the caregiver’s cell phone
  • Only one install needed if receiver is kept plugged into vehicle’s OBD port
  • Helps ensure proper use by providing guidance on installation, how-to videos, FAQ’s, direct link to customer service and more through the SensorSafe app
  • App can monitor up to 16 chest clips on a single platform
  • App download available for Android and IOS


  • Measurements: Forward-facing (Fully upright) H 25.5” x W 20” x D 25.3”
  • Weight: 26 lbs.
  • Use from Birth up to 120 lbs. or 57 inches, following the directions in your user manual

5 Reviews

  • 4
    Awesome seat!

    Posted by Esobel9 on Mar 6th 2019

    This seat is awesome. I had a graco and we liked it but the issue for me was securing her in the seat. The straps never let out enough and it was difficult to get her in. With this seat i don’t have any of those issues. My daughter has plenty of room to get in and it’s much easier for me to make sure she is right and secure in the seat. The other feature of the straps that we love is the padding around the shoulders. It’s not too bulky as to hit her face and it’s comfortable. She used to complain that the straps from the graco seat would hurt her. She doesn’t complain at all anymore. She refers to it as her “Nice seat!”

  • 4
    Great Protection

    Posted by Kappa1 on Mar 6th 2019

    The carseat is perfect for baby travel. Easy to install and works perfectly as described. The 3-position reclining headrest helps put the baby in a comfortable position. Also, it doesn't take much space, so the person sitting in the front passenger's seat can have enough leg room. The pads are very cozy which make the baby comfortanle. The SensorSafe feature alerts you when the ignition of the car is off so you dont accidentally leave forget the baby in the car. The only downside to this carseat is that the base is not detachable which makes it difficult moving the baby when sleeping without waking them up.

  • 5
    Top notch security features!!

    Posted by Sreyna on Mar 6th 2019

    This is car seat is by far the best I’ve seen! It covers all areas of concern for parents. It can be used for infants 4lbs all the way to kids that are 120lbs! It is a very nice seat with soft material. It looks and fits great in my compact suv. Installation was pretty easy just followed the instructions. There will be no more babies getting left in hot vehicles thanks to the Sensor Safe feature. The head rest tilts back for an open airway for babies. It is mind blowing all the thought and safety that was put into this car seat! We travel long distances a lot and thanks to this seat I can travel with peace of mind that by baby is safe and sound. All in all this is a top notch car seat with features out the wazoo. It is worth every penny you spend on it! We love ours!!

  • 5
    Great features!

    Posted by beachgrl8719 on Mar 6th 2019

    My daughter has been using this car seat for a week now and I am extremely happy with the durability and features of this seat! The seat is heavy duty, sturdy and easy to install either forward or rear facing. The fabric is so soft and comfortable. The recline on the seat is amazing and I do not have to worry about my daughters head falling down when she sleeps. The seat is equipped with linear side impact protection and I feel my child is very safe if there were ever an accident. I absolutely love the scensor safe alert system that I can control using an app on my phone. This way I know if she has taken off her belt or if she has not and has been potentially left in the car. I will immediately be notified. This seat is top of the line and I would highly recommend it to all of my family and friends.

  • 5
    Super easy to install!

    Posted by Anibebe on Mar 6th 2019

    This seat is for my 3.5 year old who is 40” tall and weighs 42 lbs. She’d grown out of her Evenflo Safemax car seat and so we were looking for a booster seat that would carry her all the way until she didn’t need one anymore. It’s incredibly comfy and very easy to install (we did the tether and the seatbelt through the back). All in all installation took 5 minutes which helps when you have two kids! The cup holder just slotted into place as well. I love Cybex products for their quality and ease of use and this seat is no exception. The sensor safe is a nice option too which allows us to understand when the kids need a break during a road trip. Very happy with this car seat indeed and i’ll Be recommending it to all my friends!

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