Chal-tec 10040962 Manual Del Usuario página 41

Place the child in the child seat. Place the shoulder strap on the child's
shoulder. Bring the buckle clips together and insert them into the buckle.
When you hear a "click" sound, the seat belt buckle is locked. Pull the
adjustment strap to tighten the 5-point harness.
Make sure that the child seat's
shoulder belt is slightly higher
than the child's shoulder.
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