This car seat does not convert to a booster. It becomes a "Belt-positioning booster". The back and headrest remain while using as a booster. You remove the 5-point harness and use the car's shoulder strap seat belt.
The belt positioning is done by the plastic parts at the top on either side of the seat.
Following is the link to get the instructions for this seat: http://www.coscojuvenile.com/usa/eng/Instructions
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