8 Inch Hand Sealing Machine has heated sealing bars or resistance wires. The packing is put into the device with the sealing bars or resistance wire at the desired location for sealing. The power is automatically turned off when the indication is off. Release the handle and seal it after approximately 1-2 seconds. It is very easy to install as well as simple to use. Place the plastic on the sealing surface, depress the handle, and the circuit will regulate the heating period on its own.