Can seal the openings of all kinds of plastic bags. This machine has a controlled heat-seal timer and automatic over-heat protector. The machine is energy efficient, compact and portable in size and easy operate. It can seal ordinary plastic bags or composite plastic food bags made of foil and/or wax paper. You should test the bags first before inserting goods if you are not sure of the composition of the bag you intend to use. This machine has been examined by experts and found to be superior to similar machines around the world in quality and operation.