It comes with an easy-install 6-position adjustable base that can be easily installed in your vehicle with either the integrated push button LATCH or belt lock-off for your seatbelt. Protects infants rear-facing from 4 to 35 lb and up to 32″. Extra bases sold separately. The city GO easily and securely attaches to your favorite Baby Jogger stroller to create a travel system. Simply attach the car seat adapters (sold separately) to your stroller, and you’re travel system ready.