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usage: manual plastic bag sealing machine without the power switch, the AC power line is plugged into the socket. According to the thickness of the material to be sealed, the heating time is adjusted. The plastic bag is placed on the sealing surface, and then the handle is pressed, and the circuit automatically controls the heating time. When the light goes out, the power is automatically cut off. After about 1-2 seconds, release the handle, then seal it up.