Car Seat Base FeaturesCorrect fitting indicatorsOne-click seat installationHeight adjustable support legIndividually adjustable ISOFIX connectors3-Year warranty when registeredNeed help Read our Car Seat GuideAbout this Car Seat BaseThe Cybex Base M Car Seat Base works in conjunction with the Aton M and Sirona M i-Size car seats to provide Cybex's safest ride yet. This highly flexible solution offers rearward-facing car travel from birth all the way to 4 years old, giving you significantly enhanced protection for your child s head and neck.The one-click installation makes the Base M very easy to use, since it works with the ISOFIX system and installation indicators also provide confirmation you have correctly installed the base and seat, giving extra peace of mind.With Cybex Aton M and Sirona M i-Size, you can keep your children rearward facing up to approx. 4 years old. What s more, both seats are very easy to use, they click-in in less than a second on the Base M. All you have to do