The burner must not be used continuously for more than one hour. The term total working time refers to the frequency of use between refills. The term continuous operating time refers to how long the tool can be used without interruption. Mini gas burner. Piezoelectric ignition The rear knob is used to select the size of the flame, the air mixture control determines the intensity of the flame Ideal for silver soldering, light soldering, etc. Burner can be placed on its removable stand for hands-free operation Optional soldering iron or flameless hot air nozzle for heat shrink tubes