WASHINGTON, D.C. --- Evenflo is recalling approximately 1 million Discovery child safety seats that could fail to adequately protect children in a high-impact side collision.

The model numbers and date of manufacture are located on a white label at the bottom of the car seat. The National Highway Traffic Safety Administration is urging parents with Evenflo Discovery child safety seat Models 390, 391, 534 and 552 manufactured between April 2005 and January 29, 2008, to immediately check their seats.

The Discovery car seat is designed with a convenience base that attaches to the vehicle's seat and allows the seat to be attached or removed from the vehicle without removing the base. Tests conducted by NHTSA and the Evenflo company have found that this car seat has the potential to separate from its base.

Parents are urged to immediately contact Evenflo for a free supplemental dual-hook fastener to ensure the seat doesn’t separate from the base. However, parents should continue to use the child safety seat while waiting for the fastener to arrive, NHTSA said.

Owners of the affected seats can contact Evenflo (800) 356-2229.