The Comfort Fix ISOFIX base is compatible with the Hauck COMFORT FIX car seat. The ISOFIX BASE can then be used as a practical addition to the following Hauck pushchair sets: Atlantic Plus Trio Set, King Air Plus Trio Set, Maxan 3 Plus Trio Set, Maxan 4 Plus Trio Set, Rapid 3 Plus Trio Set, Rapid 4 Plus Trio and Soul Plus Trio Set, Rapid 3R Trio Set, Rapid 4S Trio Set. The ISOFIX BASE can be secured into vehicles that have an ISOFIX connection. It is easy to assemble in the vehicle with just a few manoeuvres. Simply twist out the ISOFIX connectors by 180 degrees - lock in - done. The base unlocks with a one-handed locking mechanism and automatically locks into place after positioning it on the vehicle floor. This almost completely rules out the risk of using it incorrectly. This guarantees optimum safety.