Wu-Hsingfoot type double Impulse sealing sealer installs twin elements(top &bottom) for heavier duty applications. It makes 5mm seal width. Equipped witha single or double selector switch. User has the choice of using 1 element or2 elements. This feature extends the life of the sealer and at the same timeincreases its versatility. By foot control, the hands feed the machine to beexcellent seal.