How to Use 1. Put the Welding Rod into the Clamping Port to Tighten. 2. Put the Ground Wire into the Interface to Tighten (Ground Wire Can Not Come off). 3. Rotate the Switch, the Led Display 200 Can Be Adjusted According to the Welding Status. Specifications Color: Blue Toolbox Shape: Rectangle Style: Modern Material: Steel and Flame-retardant Plastic Mount Type: Freestanding Assembly Required: Yes Power Source: Corded Electric Plug: Us Standard Screen Type: Led Input Voltage: 110v Output Power: 3000w Rated Duty Cycle: 40% Current Adjustment Range: 20-200amp Welding Rod Diameter: 1.6-3.2mm/0.063-0.126 in Welding Thickness: 2-14mm/0.079-0.55in Power Cord Length: 2m/6.56ft Ground Wire Length: About 1.2m/3.94ft Product Size: 24*22cm/9.45*8.66in.