Feature: 1. With perfect over-charge, over-discharge, over-temperature protection functions and double protection performance. The overheating protection device automatically cuts off power when overheating occurs. 2. Adjustable output power is 6 levels, no need to press, more precise welding, more stable welding. Automatic and manual modes are adjustable, easy to operate. 3. Tуpe‑C port 2A input, which makes the spot welder charge faster, about 3 hours to charge the 6700mAh spot welder, which can be used for a long time. 4. The welding pen is comfortable to use. The length of the soldering pen is 16 inches (about 40.6 cm), which makes the operation more flexible. It is a low-resistance copper material with stable welding. 5. Suitable for 18650 and other cylindrical lithium batteries, nickel metal hydride batteries, can be firmly welded. It can also be used to weld iron, steel, and stainless steel plates with a thickness of less than 0.2 mm. Specification: Item Type: Spot Welder Material: Aluminum Alloy Usage: Spot Welding Color: Black Battery Type: Lithium Battery (Built-In Battery) Battery Model: 18650 Battery Capacity: 6700mAH Output Voltage: 4.2V (Maximum) Output Current: 650A (Maximum) Design Current: 1000A (Maximum) Input Interface: Type-C Charging Port Input Parameters: 5V/2A Recommended Nickel Strip Thickness: Approx. 0.1-0.12mm / 0.004in-0.005in. Package List: 1 x Spot Welder2 x Welding Pens 2 x Welding Nickel Sheets 1 x USB Cable1 x English User Manual Note: 1. Do not store in damp or water seepage places.2. Do not use it outside the voltage and current range.