It is described as an inverter welder, often marketed under “300 Amps Heavy Duty Inverter Welding Machine / 300A” models.
Input requirements: around 220–230 V at 50–60 Hz (i.e. standard single-phase mains voltage in many regions).
Current output range: advertised as 20–400 A (some adverts go up to “500 amps”) which suggests a fairly wide welding range, from light gauge metal up to heavier fabrication.
Electrode compatibility: works with electrodes roughly 1.6 mm to 5.0 mm diameter — suitable for a variety of arc-welding electrodes.