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Cybex Eternis S SensorSafe All-In-One Car Seat

Cybex Eternis S SensorSafe All-In-One Car Seat

1 review
Regular price $379.95
Regular price Sale price $379.95
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Color : Lavastone Black
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This is the only car seat you’ll ever need! The Cybex Eternis S SensorSafe All-In-One Car Seat checks all the boxes. Rear-facing, forward-facing, and booster, this All-In-One Convertible Car Seat is designed for use from birth up to 120 lbs.

With SensorSafe technology, you will be alerted when unsafe situations arise. Alerts are provided through a vehicle receiver and the caregiver’s smartphone that are connected to the chest clip of the car seat. 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, or when a child has been seated for too long, an alert will sound.

Additionally, Linear Side-impact Protection absorbs up to 25% more impact forces in the event of a near side impact and a patented 3-position reclining headrest helps prevent your child's head from falling forward.

These features provide advanced child safety protection and parent peace of mind.


    • Grows with your child, from infant 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 absorbs up to 25% more impact forces in the event of a near side impact collision
    • 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

    How SensorSafe Works:

    • 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

    Installation Options

    • Base Rigid LATCH
    • Seatbelt Installation 

    What's Included

    • Cybex Eternis S SensorSafe All-In-One Car Seat
    • Removable Infant Insert
    • Removable Cup Holder


    Weight/Height Capacity 

    • Use from birth up to 120 lbs or 57"
    • Rear-facing mode: 4-50 lbs
    • Forward-facing mode: 22-65 lbs
    • Belt-Positioning Booster: 40-120 lbs

    Weight and Dimensions 

    • Weight: 26 lbs
    • Dimensions: Forward-facing (Fully upright) 25.5”H x 20”W x 25.3”D

    Materials and Care Instructions

    • Fabrics machine washable cold, delicate cycle, mild detergent

    Compatibility + Accessories


    • Additional Car Seat Cup Holder

    CPS Techs

    What is a CPS tech?

    A CPS tech is a Certified Passenger Safety Technician. Our Cubby Moms who have certified as CPS techs are specially trained on how to properly install car seats and booster seats, ensuring they know everything there is to know about keeping children safe in vehicles.
    Through required continuing education courses and hours of personal research and team training, our CPS techs are able to remain up to date on the latest technical information regarding child safety.
    Question mark icon

    How does a CPS tech get certified?

    In order to become certified, each prospective tech must attend The National Child Passenger Safety Certification Training Program. After intensive classroom instruction, they must pass a variety of written tests, demonstrate their knowledge through hands-on skills assessments, and perform safety checks at a check-up event before becoming certified. They learn the ins and outs of car seat installation possibilities, installing car seats in different vehicles, harnessing methods, and more. The car seat and safety industry is constantly changing, so our CPS techs here at The Baby Cubby are an invaluable resource for parents purchasing a new car seat, or for ones who simply want someone to double check that their current car seat is properly installed.
    Customer service icon

    How can I get in contact with a CPS tech?

    You can visit our store during regular business hours to consult with a CPS tech. This is a service we provide all year round because we’re passionate about helping parents and keeping kids safe! If you’re not local, you are always welcome to contact The Baby Cubby via phone to get the peace of mind our highly-trained techs can offer when it comes to child car safety. To contact our CPS techs, use the options listed below.





    Car Seat Return and Shipping Policy

    Car Seat Returns

    Due to safety concerns, only unopened car seats can be returned. Safety is our top priority and we want you to keep your kiddos safe. If you have any questions, please reach out to 

    Car Seat Shipping

    Free Shipping applies to standard shipping orders over $95 within the continental U.S.A. Unfortunately, orders shipping to Alaska, Hawaii, Puerto Rico, or APO/FPO addresses do not qualify for free shipping.
    Large furniture items that must ship as freight such as cribs, gliders and dressers have a separate furniture delivery fee.

    Free 5-7 days shipping is available on every order over $95 (excluding taxes and shipping fees) in the continental U.S.A. If you are in need of expedited shipping, the cost will be dependent upon your area and how fast you are wanting it shipped to you. You can get a shipping quote in your cart at checkout.

    Shipping Timeline

    For standard shipping, FedEx and USPS have up to 5-7 business days to deliver your order. However, most items arrive within 3-5 business days.

    To track your package, follow one of the links below:

    United States Postal Service (USPS) Tracking:

    FedEx Tracking:









    Best Price Guarantee


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    and that baby gear and supplies quickly add up. If
    you find a lower price on any item that we sell, we
    will gladly match it.

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    A one-time price adjustment per item will be honored
    when items are purchased at full retail price and the
    merchandise (of the same style, color, and size) is
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    Customer Reviews
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    Denise R.

    Must have

    I have two little ones in car seats, 2 cars = 4 car seats so I guess I can say I know a bit about different seats... this is our first Cybex and we are HOOKED! Safety features are awesome, the fabric is buttery soft for our delicate babies skin


    We LOVE this review!! Thank you so much for sharing and shopping with us! :))####Hi Denise, Thanks for the review! We are so happy to hear that this car seat is a hit in your family! We love hoe soft the fabrics are and the SafeSensor is incredible! Please let us know if you have any questions regarding installation or use!