3 In Muilt Function includes HF DC TIG ,Plasma Cutting and MMA 18mm Cutting Thickness is available Air Flow Meter on the front panel is easy to check air flow during the setting and cutting Mulit Functions and Portable Size are suitable for outdoors and indoors using,special for decoration industry Built-in Air regulator is included Built-in Proection Circuit of over temperature and over voltage and over current for better reliability.