Dual Usage: hand held the welder to welding without connected with any accessories or connected it with electric welding tongs. One Key Operation: thrust / current one knob regulation, increase welding current at the moment of contact. Good Heat Dissipation: heat dissipation holes are designed at the front and rear, which can effectively dissipate heat without burning the machine after long-time welding. Portable Design: mini compact welder can be used anywhere you need, which is very convenient, easy for carrying, translation and storage.