ITEM# 518002153

Cybex Sirona M Sensorsafe 2.0 Convertible Car Seat - Pepper Black

This item is discontinued.
Cybex Sirona Cup Holder
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Advanced child safety protection along with caregiver peace of mind, all in an easy-to-use, convertible car seat—the Sirona M with SensorSafe. Part of the CYBEX Gold Car Seat family, the Sirona M with SensorSafe integrates important safety technology into the chest clip of the car seat to alert when unsafe situations arise.

The Sirona M with SensorSafe 2.0 monitors the well-being of the seated child through the smart chest clip that is synced with the installed vehicle receiver and the caregiver's smartphone. The Sirona M with SensorSafe 2.0 offers an adjustable Linear Side-Impact Protection (L.S.P.) System, which can reduce side impact forces by up to 25% when used properly, and a 12-position height adjustable headrest with integrated no-rethread harness for protection that grows with your child.

Whether rearward or forward-facing, the CYBEX Sirona M with SensorSafe 2.0 features an adjustable Linear Side-impact Protection system (L.S.P.), increasing the level of safety in case of a side-impact collision. The L.S.P. system can be individually adjusted on the door facing side of the car seat and can absorb up to 25% more impact forces in a side-impact collision in combination with the head and shoulder protectors.

In combination with the adjustable Linear Side-impact Protection System, the height-adjustable headrest adds to the excellent side-impact protection of the Sirona M with SensorSafe 2.0 convertible car seat. The length of the harness changes automatically when the headrest is adjusted. This prevents any need for the difficult threading in and out of the harness and makes it almost impossible to misuse.

The Newborn Inlay provides a near-flat angle in the seat of the Sirona M with SensorSafe 2.0, helping to prevent baby's head tipping forward while it sleeps, which can lead to serious breathing problems. Along with German doctors and midwives, and taking into account the findings of many tests, this function was developed to enable a safe lying angle between head, neck and chest, thus significantly reducing the risk of suffocation. This seat insert is removable after the child reaches 11 lbs., to provide more space and comfort for growing children.


  • 5-point safety harness with SensorSafe 2.0 Technology integrated in the chest clip
  • Adjustable Linear Side-impact Protection (L.S.P. System) absorbs up to 25% more impact forces in the event of a side impact* (*when compared to the same car seat without L.S.P. extended)
  • Magnetic belt holders for easy entry and exit from the seat
  • Rear-facing installation from 5 lbs. to 40 lbs., or Forward Facing from 22 lbs. to 65 lbs.
  • Energy absorbing shell helps reduce the forces felt by the baby in a collision
  • 12-position, height-adjustable headrest with an integrated no-rethread harness for protection that grows with your child
  • 10-position one-hand adjustable recline for the best fit to your car
  • Cup holder can be positioned on either side and is dishwasher safe for easy clean up
  • Cozy harness pads with anti-slip backing and comfort padded buckle cover

  • Removable newborn insert provides support from 5 lbs. to 11 lbs
  • Install using LATCH or the vehicle seat belt for a safe and secure connection to the vehicle seat
  • 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 in the seatback when not in use
  • Ergonomic design in CYBEX’s iconic Gold Design language
  • Designed and engineered in Germany

Sensorsafe 2.0

Originally developed to help prevent the rising number of infant hot car deaths, SensorSafe 2.0 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 take action 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 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 themselves 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 to prevent misuse by providing guidance on installation, how-to videos, FAQ’s, direct link to customer service and more through the Sensorsafe 2.0 app.
  • App can monitor up to 16 chest clips on a single platform
  • App download available for Android and IOS


  • REAR FACING DIMENSIONS: 18.5 H x 20 W x 29 L
  • SEAT WEIGHT: 24.7 lbs
    • Rear-facing: 5-40 lbs
    • Forward-facing: 22-65 lbs
Product Reviews
out of 5.0
35 Reviews
Ratings Snapshot
of Reviewers
Miramar, FL
Verified Buyer
First experience with Cybex
April 1, 2024
Solid car seat, decent quality materials and straightforward installation. Kid is comfortable take nice naps on it. It is on the bulky side if you're planning to travel. The sensor/app is very useful. Good purchase if you buy it at the right price.
  • Sensor
Best Uses
  • Use as your main daily car seat.
  • Boring colors
Spokane, Washington
Verified Buyer
We love it!
June 12, 2023
I’ve had lots of car seats but this one is just amazing. Very compact and roomy. Easy to buckle and unbuckle, easy to install using a seatbelt.
Brooklyn, New York
Verified Buyer
March 20, 2023
I honestly expected better. I have the Cybex carriage and I am in love with it so I was excited to get the Cybex but I was underwhelmed. It was uncomfortable for my two year old. There didn't seem to be much wiggle room to adjust the seat and it was hard to get to the button to adjust since it was close to the seat. It had nice comfy cushioning but overall I wouldn't get it again.
Cody H.
Verified Buyer
December 26, 2022
Very Comfortable and easy to get in and out of!
  • Lots of positions to for forward and backward facing. Good quality.
  • Would be hard to transfer from one vehicle to another.
Safe and comfy!
May 3, 2022
The quality of this car seat far exceeds that if many American brands. We bought this one after having a Cybex infant car seat and probably won't ever get another brand!
This product review was collected by the manufacturer.
not recommend
December 23, 2021
will not recommend this car seat. not worth it my first one broke they sent me another one and it does not side correctly.
This product review was collected by the manufacturer.
December 22, 2021
Very difficult to secure in car. Broke after being used for about 6 months.
This product review was collected by the manufacturer.
Verified Buyer
July 21, 2021
We love this car seat, it's open enough for child to look around yet side, head well protected, specious and comfortable. My son is still an infant so it's rear faced, hopefully it will be just as comfortable front faced. Looking forward for it to serve well and last long.
upstate NY
Verified Buyer
Not the quality I was expecting
June 15, 2021
I was very excited about this seat. We got the matching booster for our older child also. But I just was not impressed by the quality or the feel of the seat. The sensor safe clip is also kind of annoying to undo. We have to bring my baby to urgent care and I was trying to get him out of the seat and needed two hands to do so.
For comparison my older child had a maxi cosi seat and in our other car for my youngest we have the uppababy Knox seat. Concidering the price on this cyber seat and having had used a cybe infant seat I was surprised by how the material and the seat overall felt relatively cheap.
The sensor safe is a cool option though as it dings a little song when you turn the vehicle off.
I think overall this would be a great extra seat for a car baby isn't in all the time. 1 because it's not terribly comfortable feeling and 2 the sensor safe is a nice feature incase you didn't often have the baby with you.
  • Sensor safe is neat!
Best Uses
  • As an extra seat for a car your child isn't often in
  • Feels cheap and uncomfortable
Verified Buyer
very good buy
April 14, 2021
We bought this chair and when it arrived we found it to be a very safe chair and a very beautiful model.
Jeniffer A.
Bowie , Maryland
Verified Buyer
April 3, 2021
El color Pom! S?per f?cil de instalar y con acabados s?per delicados , el sensor safe muchas veces se vuelve molesto al ser tan insistente en las alertas pero pufff para eso est? dise?ado Jajajja... cada centavo invertido en este producto vale la pena .
Houston, Texas
Verified Buyer
Love the design and grey color
March 18, 2021
Great quality and nice looking. I have maxi cosi carseat for my first child, cybex is a winner.
Las vegas
Verified Buyer
Ferrari car seat
September 12, 2020
I like it!
Ashley C.
New York
Verified Buyer
Features matched my expectations
September 10, 2020
My concern was with the safety features of the seat. We are big FANS of cybex I was so super excited to order this and when the car seat arrived it was everything.
  • Ease of use, style and features
Verified Buyer
July 12, 2020
This car seat is the best, high rate in the crash test, very cool design, easy to install and safe with 3 type of installation. Is very comfortable for my baby. And I love the color
  • Price, crash test, sensor safe, comfort
Naperville, Illinois
Verified Buyer
The safest car seat ever!
June 25, 2020
The most comfortable car seat and i love the sensorsafe feature!!!
Verified Buyer
Love sensorsafe
June 8, 2020
Nice convertible seat! Install is challenging
kelly c.
Allentown PA
Kept my daughter safe.
March 7, 2020
I bought this car seat a year and a half ago after reading reviews for months. I wanted the safest one. Well, my worst fear came true last week when we were in a bad head on collision going 50 mph. This car seat kept my daughter safe and protected as two cars crumbled. I can't imagine buying a different one now.
This product review was collected by the manufacturer.
Glenview, IL
High quality car seat!
February 19, 2020
If your going to purchase something one time for your child, this car seat would be your go to. High quality material and super safe. MY toddler girl loves this car seat and has a blast taking naps in it.
This product review was collected by the manufacturer.
New York
Verified Buyer
February 17, 2020
Great! We are using The Sirona M in rear position with a newborn. It took time to fix it in the car with the Belt, but finally it works! I am happy!
  • The manual or tutorial from Cybex should explain more about newborn ant the Sirona M, and working with the Belt.
Monroe, Louisiana
Verified Buyer
Comfortable but difficult to install
September 7, 2019
My son likes this seat, but the straps do cut across his thighs. It is also difficult to get a good install in our Suburban. We have to use the seatbelt and lock off to install in the Suburban.
Verified Buyer
super secure and love the color
June 15, 2019
my son feels very secure and super comfy in that
Silicon Valley, California
Verified Buyer
Best Carseat Ever!
May 1, 2019
The texture is nice and soft. It is also cool which is a huge bonus for the California summer.
The space in the car seat is larger than Graco, so the baby feels more free in it.
Verified Buyer
Best car seat
March 29, 2019
We love this car seat.
Sensor Piece of Mind
March 28, 2019
We have found Cybex with our first daughter and now that I am 4 days overdue with my second baby they too will be in Cybex soon. The reason we chose this was because of the sensors. My daughter was an escape artist and we would get to our destination only to find she was practically out of her seat due to the clips in other types of car seats. I wanted that piece of mind and the ability to pull over quickly if she was able to break free.
This product review was collected by the manufacturer.
winter garden, FL
Verified Buyer
Security and confort for my baby
March 24, 2019
This is the most secure and comfort convertible my baby ever try. With an extra side impact security layer I choose it because I also loved the color and design.
Best purchase ever.
  • Security
  • Price
Fullerton, California
Verified Buyer
Good Carseat
November 20, 2018
My little one seems to be comfortable in the car seat.
I like the sensorsafe technology. It tells me when the seat is buckled or when the kid is left in the car after the engine is off.
It was a little hard to install and the instructions are not easy. I wished they had a video of how to install.
My only 1 complaint is that the seat belt somehow seems to get longer on the right side.
  • good looks
  • comfortable
  • hard to install
Verified Buyer
Best car seat
October 27, 2018
I already have other car seat from other brand and i loved it, but this one is much better. It is perfect.
Oklahoma City, Oklahoma
Verified Buyer
Sturdy seat
August 12, 2018
Seat seems comfortable for our 2 year old son. I love the sensorsafe feature. This seat was a bit more challenging to install compared to our Nuna Rava. Overall at great seat for the price.
  • Sensorsafe technology
  • Installation
Hallandale beach Fl
Verified Buyer
July 28, 2018
Wonderful car seat!
  • technology, safety and comfort are the main characteristic
Best Uses
  • babies over 6 months
  • -
Verified Buyer
Cybex quality
June 14, 2018
Nice looking, easy to install and apparently according to my 3 year old toddler very comfortable. #carnap
New York
Verified Buyer
Not as impressed as its infant car seat cloud q
June 5, 2018
For those of you who have cloud q and expect to get premium quality convertible car seat, this is NOT something you want to get. The material is ok but not nearly as good as cloud q. I had nuna rava for my older kid which is significantly better than sirona in terms of quality. For example the headrest feels really hard and seems there is very little cushion. But I can't really compare them given close to $200 price difference. Overall a fair product. I guess it priced right but I'm a little disappointed.
Brookpark, Ohio
Verified Buyer
May 15, 2018
I love this seat, soft comfortable and has great technology . I would buy again.
Best Uses
  • Infant and up.
  • Heavy
Minneapolis, Minnesota
Verified Buyer
Nice car seat for reasonable price
April 2, 2018
We have a foonf, a rava, and this seat. This seat is lighter and more user friendly to install. It seems just as comfortable for our little one as fhe others. However, the materials are not greenguard certified. Overall, a pretty nice car seat.
cypress, tx
Verified Buyer
Best ever!
March 6, 2018
As the mom of 4 children, I've had many car seats and this one is by far my favorite. My 8 month old son loves this seat - its like his own little recliner and he never fusses when I put him in it.
  • The multiple incline positions
  • Very easy to attach to the car
  • First straps Iâ
Customer Q&A