Cybex Sirona M with Sensorsafe 2.0 Convertible Car Seat

Cybex Sirona M with Sensorsafe 2.0 Convertible Car Seat

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CYBEX Sirona M with Sensorsafe 2.0 Convertible Car Seat

Car Seat Weight 24.7lbs
Forward-Facing Capacity 22-65lbs
Rear-Facing Capacity 5-40lbs
Rear-Facing (in): 18.5 H x 20 W x 29 D
Forward-Facing (in): 25 H x 20 W x 21.5
Included Accessories Cup holder, newborn insert


Introducing advanced child safety protection and caregiver peace of mind in an easy-to-use, convertible car seat-the Sirona M with SensorSafe 2.0. The newest addition to the CYBEX Gold Car Seat family, the Sirona M with SensorSafe 2.0 integrates important safety technology into the chest clip of the car seat to alert when unsafe situations arise.


  • Integrated SensorSafe 2.0 Technology monitors the well-being of the seated child
  • Adjustable Linear Side Impact Protection System
  • 12-position height adjustable headrest with no-rethread harness
  • Caregiver peace of mind with the SensorSafe 2.0 smartphone application
  • Rearward installation up to 40 lbs., Forward installation up to 65 lbs.

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.

The Sirona M with SensorSafe 2.0 provides the essential alert through both the vehicle receiver and the caregiver's cellphone when the driver accidentally leaves the child behind in the car, but also alerts the driver if a child unbuckles themselves while the vehicle is in motion; if the back seat has become too warm or too cold; and if 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.

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.

With the 12-position height-adjustable headrest with integrated harness guide, 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.

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. The innovative user-friendly app, also provides guidance on installation, how-to videos, FAQ's and more to help prevent 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.

Because 59% of accidents are head-on collisions, CYBEX recommends transporting children in a rear-facing position for as long as possible, preferably up to 4 years old or 4 lbs. In a head-on collision a rear-facing seat distributes the strong front-impact forces across the seat's back, significantly reducing the strain on the child's neck and head.

Depending on your preference, the Sirona M with SensorSafe 2.0 can also be used in a forward-facing position for children who are at least 2 years old or 22 lbs.

5 Reviews

  • 5
    The Safest

    Posted by Sasha on Oct 3rd 2018

    We're super happy with our Cybex Sirona! Safe, sturdy, and very comfortable for our son. Easy to install, and the bluetooth app is great for peace of mind.

  • 5
    Best Car Seat To Date

    Posted by JonJon Large on Feb 27th 2018

    We have three kids and have had at least four car seat models already. And the new Cybex Sirona M is the best one to date. It makes everything easy....from installing it to taking it out. On that, I always find it hard to get the car seats out, but the new Cybex has two easy pulls, which simplifies that process. It makes it easy to put the kids in and out - especially the magnetic holders to hold the belt open when you try to get your kids in place. And it is so safe — with the special side impact system. We highly recommend the car seat!

  • 5
    Great combination of Safety, features, and comfort

    Posted by sironamom on Feb 25th 2018

    The Sirona M is a next generation car seat for your child. The app takes a few minutes to set up and get used to, and once it's done you have features that separate this car seat from any others on the market. Besides the technological features, the seat is built for safety and built to last, both of which are very evident the minute you get it into your car. Overall we are extremely happy with this car seat and would recommend to anyone who is in the market for a new one.

  • 4
    Super Safe and stylish!

    Posted by Rosie on Feb 7th 2018

    This carseat is so safe and comfortable for my little one. It also looks pretty good in the car:) . At first my husband and I had trouble installing it in our car, but we emailed CYBEX and they sent info immediately. I have had a little trouble with the release button, but it seems to be working better now that we have been using the seat for a few weeks. It definitely runs big, my little girl swims in it and is almost 9 months old. Aside from those few glitches, it is an awesome seat and I know she will be comfortable in it for years.

  • 4
    Excellent Car Seat!

    Posted by JWDavis on Feb 5th 2018

    We had a bit of a shaky start with the Sirona M. I had to poke around to find the instruction manual. (located in a compartment on the back of the seat). Then had quite a time figuring out how to tighten the straps fully. I read and re-read the instructions over and over to see what I was missing and couldn't find anything. Finally I emailed Cybex! I got some great customer service and they walked me through the missing step. Also, my baby girl weighs 15 lbs and is still too small to remove the infant insert. I don't know what kind of 11lb. baby they were testing this on?! I DO think they can use a little help on their instruction manual though. That said, now that it is installed, I couldn't be happier with this seat.

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