Simple and fast operation. With the latest technology, this handheld food saver is very easy to use and does not require preheating. When the cover is pressed, the high-efficiency and low-loss heating film will immediately reach the sealing temperature. Place the bag to be sealed in the middle, and then slide it along the edge of any bag at a slow and constant speed to achieve an air-tight seal. Not suitable for pure paper bags and pure aluminum bags.