The Cybex Sirona M2 complies with the European regulation for child seats, ECE R-129 (i-Size). This regulation mandates, among other things, the installation of child seats using Isofix and the rear-facing transport of children up to 15 months of age. Traffic physicians, accident researchers, as well as consumer and health organizations recommend transporting children in rear-facing car seats even beyond group 0+. In the Cybex Sirona M2, children can be safely transported rear-facing from birth up to a height of 105 cm (approximately four years). Thanks to its intelligent design, even larger children have enough legroom to sit comfortably. At the same time, the seat can be easily installed in small cars. Practical features such as the one-handed seat and recline adjustment further facilitate daily use. Important: The Sirona M2 i-Size can only be used in combination with the Base M and cannot be installed in the vehicle on its own. The Cybex Isofix Base M must be purchased separately and is not included in the delivery.