1. Built-in MOS tube, capable of handling 550A current 2. Integrated design, simply connect the battery to use 3. Copper needle is removable and replaceable 4. 99 levels of stepless adjustment for more convenient operation 5. Equipped with a trigger button for easy welding activation; includes built-in LED indicator Spot welding material: 0.1mm nickel-plated strip Welding pin specification: 3MM x 1.5MM x 40MM professional aluminum oxide brazing pin Can the copper needle be replaced: Yes Usage Notes: 1. Recommended to use a 12V 20AH-60AH lead-acid battery with good performance, or a high-rate 3-series or 4-series power lithium battery pack, or a car emergency start power supply as the power source. (Must have sufficient performance, at least capable of starting a car; voltage range 12V16.8V) 2. Connection interface should be secure; do not extend wires arbitrarily. Begin spot welding at low power and gradually increase as needed to avoid excessive current affecting the MOS tube performance. Do not reverse polarity at the input terminal and do not operate outside the specified voltage range 3. Recommended for welding 0.1mm nickel-plated steel strips; acceptable results on 0.2mm can be achieved by double-layer welding. Not suitable for pure nickel, copper, or aluminum materials Performance Parameters: Body size: 25mm x 170mm Wire length: 350mm Wire specification: 12AWG silicone wire Power interface: copper lug Operating voltage: 12V16.8V Spot welding current: 80A150A Power component: 550A MOS tube Housing material: high-temperature resistant nylon Color: grey Material: nylon + metal Package Contents: 1 pair of soldering tools 1 roll of nickel sheet (width 6mm, thickness 0.1mm, length approximately 6m) Only the above items are included; other products are not included Note: Lighting reflections and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement error allowance: 13cm