Cybex Eternis S SensorSafe All-In-One Car Seat
Cybex Eternis S SensorSafe All-In-One Car Seat
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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.
Why Trust Baby Cubby?
Why Trust Baby Cubby?
Thousands of parents have trusted us for over 11 years. Here's why you can shop confidently with The Baby Cubby.
1. 11+ Years in business & two brick & mortar stores with consistent positive reviews. See our store here
2. We've helped over 100,000 families find products they love and trust
3. Price match guarantee + Free Shipping
4. Curated products and tested gear - we spend hundreds of hours training and learning so you don't have to.
5. Gear Experts - our team has created hundreds of how to's and product videos that have over 21 million views. We know gear and are here to help answer your questions.
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7. Love your stroller guarantee - If you don't love it, return it within 60 days, even if used.
8. CPST's - more child passenger safety technician's on staff than any other specialty baby retailer in the USA. Be confident your child is safe in their seat.
9. Incredible service - we're parents too, you deserve to be treated like a person, not a dollar sign.
10. We've been featured by multiple news outlets and even by Google over the years, check out some of the press we've received here
11. Family owned & operated small business. When you shop with us you are supporting a small business that cares about its team members.
12. Nothing matters more than family, let us help your family find products you love and trust.
Best Price Guarantee
Best Price Guarantee
The product must be the exact same color/style/size and be in stock on competitor’s website. Unfortunately, we cannot price match auction-based websites and the seller must be an authorized distributor of the brand. Some brands and manufacturers are excluded from our price match policy.

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when items are purchased at full retail price and the
merchandise (of the same style, color, and size) is
discounted within 14 days of the original purchase date.
not eligible for price adjustments.
Price adjustments are not provided during Black Friday or
Cyber Monday sales.
Car Seat Returns
Car Seat Returns
You can return your car seat within 30 days if it is unopened and unused. See our full return policy here.
Easy Returns within 30 days
Easy Returns within 30 days
You can return your car seat within 30 days if it is unopened and unused. See our full return policy here.
Shop Confidently - Talk to our Gear Experts
Shop Confidently - Talk to our Gear Experts
Gear Experts
Have Questions?
What is a CPST?

How does a CPS tech get certified?
Features
Features
- 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
Rewards
Rewards
What's Included
What's Included
- Cybex Eternis S SensorSafe All-In-One Car Seat
- Removable Infant Insert
- Removable Cup Holder
Specifications
Specifications
Weight and 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
Product Weight and Dimensions
- Weight: 26 lbs
- Dimensions: Forward-facing (Fully upright) 25.5”H x 20”W x 25.3”D
Installation Options
- Base Rigid LATCH
- Seat Belt Installation
Care Instructions
- Fabrics machine washable cold, delicate cycle, mild detergent
Compatibility + Accessories
Compatibility + Accessories
Accessories
- Additional Car Seat Cup Holder
Additional Resources
Additional Resources
- Reviews
- Questions
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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
BabyCubby
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!


