The ground breaking king ii ats actively watches over your child throughout their journey it checks correct harness tensioning as you leave it adjusts as you go dynamically retracting the harness to keep tension just right and it monitors throughout alerting you of any issue which means you can keep your eyes on the road aheadguarantee2 year guarantee for manufacturing or material defects on all products for two years warranty begins on the date of purchase please retain receipt as proo