This button is used when vacuum packing delicate food, or food with liquid, or in any other cases that
pre-sealing is needed. While the machine is vacuuming the bag, press this button with your left thumb
while your hands are still pressing both sides of lid. Then the machine stops vacuumizing and starts
sealing, at this time, the blue indicator light blinks. When the light goes off, take your hands off the lid
and the pre-sealing is done.
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