You can adjust amperage and voltage but it picks the wire feed speed. The welder operates on 110 or 220 volts. To use it on 220 they provide an adapter cord with a 50 amp 220 plug on one end and terminating with a 110 volt 15 amp receptacle. What engineer would design such a thing and how did they get that through certification. This adapter would allow you to plug a 110 appliance into a 50 amp 220 outlet.