Product Details + The KeyFit® 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.The KeyFit® Base is designed for use with the KeyFit® and KeyFit® 30 infant car seats. (car seats sold separately)Click-in attachment for the KeyFit® and KeyFit® 30 infant car seatsReclineSure® leveling foot helps achieve proper base angleRideRight® bubble level-indicators verify base angle SuperCinch® LATCH tightener helps achieve a secure fitSmooth underside helps protect vehicle seats