The Chicco KeyFit Infant Car Seat Base is engineered with innovative features that make it the easiest infant car seat base to install simply, accurately, and securely every time. A ReclineSure leveling foot and two RideRight bubble level-indicators help achieve and verify proper angle in the vehicle seat. It’s also equipped with premium LATCH connectors and a SuperCinch tightener for a secure fit with a fraction of the effort! For alternate installation with the vehicle seat belt, clear belt routing and integrated lock-offs make it easy to position, tighten and lock the belt into place. A smooth underside helps protect vehicle seats from damage. For use with the Chicco KeyFit and KeyFit 30 infant car seats. (sold separately) By Click-in attachment for Chicco KeyFit and KeyFit 30 infant car seats ReclineSure leveling foot helps achieve proper base angle RideRight bubble level-indicators verify base angle SuperCinch LATCH tightener helps achieve a secure fit Smooth underside helps protect vehicle seats