Four position, adjustable base helps ensure an accurate install and helps keep baby comfortable as he or she grows. Compatible with current GRACO infant car seat models. Easy installation of stay in car base using a latch system. It is a combination of the most rigorous crash tests that helps protect your child in frontal, side, rear and rollover crashes. Perfect for your extra car or in grandmas. I only used it several times and he is now in a much larger infant car seat. Perfect condition.