for children 5-65 lbs. / Birth - 18 months

Sirona M

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The newest addition to 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.

Your baby will ride surrounded by comfort and, most importantly, safety in the Sirona M with SensorSafe. You as the caregiver will receive essential alerts to the well being of your child, but also includes top safety functionality, including the L.S.P. System, which reduces forces felt by the baby by up to 25% should you experience a side impact collision and a 12-position height adjustable headrest with an integrated no-rethread harness for protection that grows with your child.

Why you'll love it

The Sirona M with SensorSafe 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; and while originally developed to help prevent the rising number of infant hot car deaths, the Cybex design of this technology has been expanded to ensure safety for children in a range of additional situations.

The Sirona M with SensorSafe still provides that essential alert when the caregiver accidentally leaves the child behind in the car, but also alerts the caregiver 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 other useful information to help prevent car seat misuse.

  • 5-point safety harness with SensorSafe 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*
  • Magnetic belt holders for easy entry and exit from the seat
  • Rear-facing installation from 5 lbs. to 40 lbs., or Forward Facing from 20 lbs. to 65 lbs.
  • 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
  • 2 Year Warranty
  • Engineered in Germany
  • SensorSafe Technology available on select models ONLY
  • SensorSafe is compatible with most vehicles 2008 or newer with an OBD II port. For some electric vehicles, contact Parentlink as an additional adapter may be needed

*when compared to the same car seat without L.S.P. extended

Peace of Mind:

Returns: 30 days


Installation Manuals: Browse »

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Product Details

Child Specs (5-65lbs)


  • Weight: 5 - 35 lbs
  • Height: 19 - 37 inches


  • Weight: 22 - 65 lbs
  • Height: 38 - 49 inches

Product & Shipping Specs

  • Dimensions: Rear-facing (fully reclined) H 18.5” x W 20” x D29” - Forward-facing (Fully upright) H 25” x W 20” x D 21.5”
  • Product Weight: 24.7
  • Package Width: 20
  • Package Weight: 24.7
  • Package Depth: 21.5
  • Package Height: 25