Mini Spot Welder Portable DIY Welding Machine Kit 18650 Lithium Battery Spot Welding Equipment for 0.1-0.12mm Nickel Strip, Micro USB Interface Specification: Item Type: Mini Spot Welder Battery Type: Rechargeable Polymer Lithium Battery (Shipped With Built-In Battery) Battery Capacity: 4300mAh Output Voltage: 4.2V (Maximum) Output Current: 639A (Maximum) Design Current: 1200A (Maximum) Input Interface: Micro USB Input Parameters: 5V-1A Recommended Nickel Strip Thickness: 0.1-0.12mm Package List: 1 x Spot Wedler 2 x Quick Release Pen 1 x USB Charging Cable How to Use: Press the white button to start, adjust to the red display, the gear can be adjusted automatically according to the demand, the green light represents the power, and the red represents the gear. Do not press the soldering pen hard when welding! Gently force the nickel sheet to contact the battery! Welding is not strong enough! You can try your hand more to find the right pressing force! Note: Attention! Do not press the soldering pen hard when soldering! Gently force the nickel sheet to contact the battery! Welding is not strong enough! You can try your hand more to find the right pressing force! The 0.1 nickel chip sent is just 2.3 gears. You can also try different gears!