It has a controlled heat-seal timer and an automatic over heat warning indicator. The sealer is energy efficient, compact & portable in size. Very simple to operate. No compressor is needed. It gives a 2 line seal. It has superior vacuum ability and can seal the openings of all kinds of plastic bags. The machine is energy efficient, compact and portable in size, and is very simple to operate. It can seal ordinary plastic bags or composite plastic food bags made of foil and/or wax paper.