This is a Royce MMA 300S Inverter Welding Machine.
It features advanced Insulated-Gate Bipolar Transistor (IGBT) inverter technology for stable performance.
The machine has a current range of 20-140A (as per the image text, although some sources state 20-300A).
It is designed to be lightweight and portable, making it easy to carry for both professional and DIY use.
It is suitable for welding with various acid or basic electrodes.