Cybex Sirona M Convertible Car Seat



The new Cybex Sirona M is the only car seat that keeps your child safe not only with its crash-protection features, but with innovative technology that alerts parents of potentially unsafe situations.

SensorSafe 2.0 technology integrated into the chest clip sends alerts to both a vehicle receiver and a smartphone. The alerts notify parents when the child has been accidentally left in the car, helping to avoid unthinkable tragedies. Alerts also sound when the child unbuckles themselves in a moving vehicle, when a child has been seated for too long, and when the back seat has become too warm or cool.

Usable from birth to 65 pounds, the Cybex Sirona M includes other features that make the seat easy and comfortable, like a 10-position recline, 12-position headrest and magnetic seat belt holders for easy entry and exit.

In a safety feature unique to Cybex, the seat includes an adjustable linear-side impact protection system—pods that extend from the sides of the seat to absorb up to 25% more energy in a crash. A tubular steel frame runs the perimeter of the seat to provide structural strength, as well as a pathway to channel crash forces away from your child. In addition to meeting American safety standards, the Cybex Sirona M performs in German crash testing with 2.5 times more crash forces than U.S. tests.


Car Seat Features

  • SensorSafe 2.0 technology integrated into chest clip (see next section for more details)
  • Rear-facing and forward-facing
  • 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
  • 12-position adjustable headrest grows with your child
  • Magnetic belt holders make it easy to get child in and out of the seat
  • Seat reclines to 10 positions to find the right position for your child and your car
  • Removable infant insert provides support for 5-11 pounds
  • Can be installed using LATCH or vehicle seat belt
  • LATCH connectors can be removed with innovative one-pull system and stored in seatback 
  • Dual belt adjusters ensure a tight fit
  • 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 2.0 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


  • Rear-facing dimensions (fully reclined): 18.5"H x 20"W x 29"D
  • Forward-facing dimensions (fully upright): 25"H x 20"W x 21.5"D
  • Product weight: 24.7 pounds
  • Rear-facing capacity: Birth to 40 pounds
  • Rear-facing capacity: 22 to 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 1 review
Derek Wilkins
Cybex Sirona M

We bought this as our second car seat. Although it looks great it’s such a pain in the a to install. Wish I would have bought the Nuna Rava which we already had. The Cybex also makes a rattling sound in the back seat where the foam is on headrest. Not happy with it and wouldn’t recommend.