Feature:1. ALL IN ONE SPOT WELDING PEN: Adopt gold plated pen tip and copper pen barrel, copper oxide aluminum welding needle, grasp every detail, only for your experience2. THICKENED AND WEAR RESISTANT: 2MM thick copper over current bar with ultra low internal resistance increases over current capability, gold plated soldering pen terminals are made of copper and gold plated technology, wear resistant and rust proof, with ultra low internal resistance3. TEMPERATURE CONTROL PROTECTION: Automatic power off when the temperature exceeds 60. The portable spot welding machine has perfect overcharge, overdischarge, overtemperature and other protection functions and double protection performance. Unique overheat protection device, automatic power off when overheated4. 6 SPEED ADJUSTABLE: 6 speed output power is adjustable, welding is more accurate and stable. Automatic and manual modes are adjustable for easy operation5. WIDE APPLICATION: Suitable for 18650 and other cylindrical lithium batteries, nickel hydrogen batteries, and cadmium nickel batteries, and can be welded firmly. Can also be used to weld iron, steel, stainless steel plates with thickness less than 0.2mm/0.007in to other iron, steel, stainless steel materials. Saving your time and effortSpecification:Item Type: Mini Spot WelderType C Input: 5V 2AMaximum Output Voltage: 4.2VOutput Maximum Instantaneous Current: 650ABattery: 2 x Polymer lithium battery 5000mahApplicable: 1. 18650 and other cylindrical lithium batteries, nickel hydrogen batteries, nickel cadmium batteries, etc.2. Mobile phone battery cells, spot welding3. Stainless steel sheets with a thickness of no more than 0.12mm.Package List:1 x Host2 x Welding Pen1 x File1 x Nickel Sheet3 x Board1 x User ManualNote:Not Applicable: Metal sheets such as copper, aluminum, and tin cannot be welded, and nickel sheets cannot be welded to the surface of metals such as copper, aluminum, tin, and soft pack batteries.