Features: 1) No need for current-limiting resistance to reduce heat resource 2) No black spots and welding points removes need for polishing 3) Built-in voltage regulator ensures constant output voltage 4) Full digital control with high precision 5) Components and parts are from world famous factories to ensure quality 6) Easy to operate, being free of complicated procedures 7) Primary welding materials: stainless steel, brass, copper alloy, duralumin 8) Suitable for welding electrical appliances, watch chains, jewelry, stainless tableware and hardware