The external pumping function can be connected to an exhaust pipe, which is used for vacuum-intensive containers.The lock cover is sealed tightly and does not leak, just press the button on both sides to press down the cover to fasten, which is reliable and labor-saving30CM extended seal can work with multiple bagsMulti-position adjustment, adjustable sealing position, compatible with various types of bags can be sealed dry, wet, soft foodProduct name: Vacuum fresh-keeping machine sealingTime: 7 ~ 10 secondsMaximum vacuum degree: 60kpaProduct size: 385mmx140mmx70mmSealing width: 3MMProduct net weight: 1.5KGMaximum sealing width: 30MM