The Britax B-SAFE™ 30 Accessory Base works in conjunction with the B-SAFE™ 30 Infant Car Seat (item# 167220 & 167255) to provide industry leading front, rear and side impact protection to manage crash forces and minimize injury. Engineered to self-guide the car seat into the proper locked position, the base also features premium push-button LATCH connectors, a built-in lock-off and a 5 position height adjustment feature. The B-SAFE™ Accessory Base is easy to install and use correctly each and every time.