One is to display voltage, with 220V and 380V or two-phase and three-phase universal types.

One is the power indicator, which is green in normal standby state.

One is the fault light, which generally does not light up. If there is a fault, it lights red and the machine starts to protect itself and doesn't work. For example, the main transformer is hot, the temperature control resistor is disconnected, and the red light is on.

There is also automatic shift time adjustment, such as 0.3. Even if you keep pressing the switch, the machine will only stop for 0.3 seconds, which is suitable for thin iron sheets or large-scale repairs. Some machines adjust the time by a knob instead of an LCD.

Another is to adjust the current, which is divided into OABC files, usually knobs.