The machine is a portable IGBT inverter welder. The MMA designation stands for "Manual Metal Arc" welding, also known as stick welding, which is a manual arc welding process that uses a consumable electrode.
Specifications found for similar MMA-400 welders include:
Input voltage: 220~230V
Frequency: 50-60Hz
Current range: 20-400A
Usable electrode: 1.6-5.0mm
Technology: IGBT inverter technology
The welder is designed for welding stainless steel and aluminum, and it features protection systems against overload, overheating, and electrode sticking.