Cybex Sirona S Convertible Car Seat with SensorSafe



The Cybex Sirona S is the only convertible car seat that protects your child and your back. The car seat rotates 360 degrees, allowing you to rotate the seat toward your car door while helping your child in and out.

Because the Sirona S can swivel from rear-facing to forward-facing, you may only need to install it a single time using the vehicle seatbelt and EasyLock system for a simple and secure installation.

The Cybex Sirona S is also the only American convertible car seat with a load leg, a metal bar that extends from the base of the seat to the floor of your car to inhibit movement and prevent head injury.

Energy-absorbing pods that extend from the sides of the seat to absorb 25% more forces in a crash, while SensorSafe technology integrated into the chest clip sends safety alerts to both a vehicle receiver and a smartphone. The alerts notify parents to potentially dangerous situations, like a child being left in a car, an unbuckled chest clip, unsafe temperatures or a child seated for too long.

With features like a no-rethread harness, included cup holder and numerous recline positions, the Cybex Sirona S offers the ultimate in convenience and safety for your child from birth to 65 pounds.



  • Only convertible car seat on the market that swivels 360 degrees using one hand for easy access in and out of the seat
  • Load leg extends from the base of the seat to the floor of your car to stabilize the car seat in the event of a collision
  • SensorSafe 2.0 technology integrated into chest clip (see next section for more details)
  • Can be used rear-facing and forward-facing up to 65 pounds
  • Tubular steel frame provides structural strength and a pathway to channel crash forces away from child
  • Adjustable linear side-impact protection absorbs up to 25% more forces in a side collision
  • Energy-absorbing EPS shell, as used in crash helmets, reduces forces to baby in a crash
  • Reclines using one hand to 8 positions rear-facing and 4 positions forward-facing
  • Belt holders make it easy to get child in and out of the seat
  • Removable infant insert provides support for 5-22 pounds
  • Can be installed using vehicle seat belt using patented EasyLock bar (recommended) or LATCH
  • Harness pads with anti-slip backing and comfort-padded buckle cover ensure a comfortable fit
  • 5-point harness
  • Tested to NHTSA and German ADAC safety standards
  • Designed and engineered in Germany

SensorSafe Technology Features

  • Chimes if child is still secured in seat when car is turned off
  • Alerts caregiver's cell phone if child is left behind in vehicle and then, if situation is not remedied, alerts designated emergency contact
  • Emergency contact receives GPS coordinates of vehicle's last known position
  • Monitors back seat temperature to alert vehicle receiver and caregiver's phone if car appears to be too hot or too cold
  • Provides alerts to caregiver when child may have been seated for too long
  • Receiver plugs into car's OBD port and syncs with caregiver's cell phone
  • App available for iOS and Android


  • Dimensions: 25.5"H x 20"W x 25.3"D (fully upright)
  • Product weight: 30.4 pounds
  • Rear-facing capacity: Birth to 50 pounds
  • Forward-facing capacity: 65 pounds or 49"

Shipping Information

Most orders are shipped via FedEx Ground from our warehouse in Scottsdale, Arizona within 1 business day.

In some cases, Strolleria will dropship an order directly from the manufacturer to the customer to shorten the delivery time. In these instances, items typically ship within three business days, but the total delivery time is reduced.

Please see this page for the number of days it takes for products shipped via FedEx Ground from Scottsdale to arrive at your location. FedEx delivers packages on Saturdays and Sundays in most cities, excluding rural areas.

Return Policy

Strolleria accepts returns of new, unused items that are returned to us within 60 days of receipt. 

Because safety is a top priority for us and all new parents, Strolleria only accepts returns of items that have never been used. Items must be returned in the same condition in which you received them, including the original packaging.

All products sold by Strolleria are covered under a manufacturer's warranty. If the product is defective or becomes damaged during the warranty period, the manufacturer will send a repair or replacement part at no cost.

Visit this page for our complete return policy.


Customer Reviews

Based on 8 reviews
Great Car Seat

I bought this car seat for my grandson since we were going on a long road trip. He loves his car seat! This is a great car seat, once you get used to setting it up, all the features it has are great. I'm sure we will use this car seat for many years to come, it is a great peace of mind knowing my grandson is in a car seat that is built for safety.

Donna Diaz

Love the car seat perfect for 3 month baby..easy to turn.

Michael Sloan
Another Great Cybex Product

This is our second Cybex car seat, the first was for infants 5lbs and up. Our daughter quickly outgrew the first one, and since we liked the Cybex brand so much we chose this one for her toddler years. CONS: Rotating the seat to the rearward facing position does not work well for toddlers; they will be cramped. However, when facing forward it provides sufficient leg room. I only wish the seat would recline more in the forward facing position. Leg locking feature is not immediately clear and could use some refinement. All fabric materials, that should have been of higher quality and easier to clean, at this price point. PROS: A great rotating design permitting easy access, as it can rotate either left, right, forward or reverse. Safety features are also a great addition. Easy to use design, once you get a feel for it.

Stephanie Valenzuela
Amazing but...

Amazing car seat! 360 swivel is so convenient but does get stuck occasionally. Sensor Safe alarm is a great feature. Seat is very plush and comfortable, no hard plastic feel. Plenty of room to grow for my 1 year old. We have a fussy baby in the car and he is a lot happier now. Only downside , it can be very difficult to install, took myself, husband and a friend about 45 minutes to get it installed properly. Even watched videos on how to install with little help but eventually got it. Be prepared to sweat a little to get it in. If you switch cars frequently I would not recommend, can be heavy and hard to install singlehandedly.
Overall great seat 5 stars but install-1. I get lots of compliments on the look and functionality!

Veronica Bullene

So i really love this brand i got the Mios stroller and the Cloud Q and they're are top quality the dame for this car seat is amazingly great the fact you can turn the seat and put you baby is a 10 but.....this my but I'm still figuring out how to put the seat correctly i bought this maybe 3 weeks ago for my husband's new truck and we installed but it seams to loose and i can't make it tighter it moves a lot also the foot doesn't stay locked on my Cloud q the foot is super thigh and the car sear doesn't balance like this one so i didn't wanna make a review coz i don't know if I'm just not skill enough to make it the right way but my husband and another friend try and bo luck so i don't know......🤷🏻‍♀️🤷🏻‍♀️🤷🏻‍♀️