Features: Made of high-quality aluminum alloy material, surface anodized, wear-resistant, fire-proof, and durable. This welder supports welding nickel-plated steel electrodes up to 0.2mm and grooved nickel rods up to 0.25mm. The integrated soldering pen has good electrical conductivity, low contact resistance, quick disassembly and assembly, and convenient wiring. The welding machine has a built-in ammeter function, which can indicate 30 levels of intensity and 25 levels of adjustable delay. It has over-discharge protection, over-voltage protection, over-current protection-current protection, short-circuit protection and over-temperature protection to ensure safe use. Can also be used to power your cell phone. Tested to ensure high performance. Specifications: Material: Aluminum alloy Power: 4.2V/1.1KA (4.62KW) Battery: lithium battery>Welding capacity: 0.2mm nickel-plated steel strip, 0.25mm slotted nickel strip Packing size: 458g Packing weight: 20*14*3cm Packing list: 1* Spot welding kit