asalvo TRIO GENIUS 16850 Manual De Instrucciones página 31

USE THE SAFETY BELT
There are 2 position for safety belt, the up position is suitable for one baby
more than 6 months, the bottom position is suitable for one baby under
than 6 months
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USE THE SAFETY BUCKLE
Click here to lock the safety buckle on both sides.
Press the middle button to release the safety button.
You can adjust the length of the seat belt by pulling the safety buckle on
both sides as needed