Specifications include, but are not limited to: Units must meet current Federal Safety Standard FMVSS 213 and contain the airbag warning label on the upper portion of seat back.Units shall be portable and shall be installed by a push button seat belt buckle and shall be able to be installed tightly and securely in the majority of vehicles sold in the U.S.A. Simple Belt Path – The belt path is the route that the safety belt must follow to secure the child safety seat to the vehicle seat. The more complicated and obstructed the belt path, the less likely parents and other caregivers will install the seat correctly, compromising the safety of the child. The belt path should allow easy installation, reducing the possibility of misuse