Features Aluminum Alloy Construction - Engineered for safety, the fireproof and drop-resistant shell ensures a longer service life for reliable performance in various environments Ele Anodized Finish - The beautiful and wear-resistant not only enhances aesthetics but also protects against daily wear and tear, maintaining its premium look Long-lasting Gold-Plated Terminals - Designed for longevity, the anti-oxidation gold plating ensures excellent conductivity, while the easy-to-assemble soldering pen offers convenience in use Universal Charging Compatibility - Featuring a standard charging interface, this machine is compatible with most mobile phone chargers, achieving a full charge in just 4 hours Enhanced Performance with Copper Strip - The 2mm thick pure copper strip minimizes internal resistance, significantly boosting the overall capacity for efficient spot welding s Features: 1、The shell is made of aluminum alloy, fireproof and drop resistant to ensure safety, making the welding machine with long service life. 2、After anodizing proc, the welding machine is beautiful and wear？resistant. 3、Gold？plated terminals poss long service life and anti？oxidation, and the soldering pen is easy to disassemble, assemble and carry. 4、The charging interface is universal, compatible with mobile phone chargers. With 5V 1A input, 4 hours can realize full charge. 5、With 2mm thick pure copper strip, ultra？low internal resistance increases capacity. 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 Thickn: 0.1-0.12mm Package List: 1 x Spot Wedler 2 x Quick Release Pen 1 x USB Charging Cable Note: Attention! Do not pr the soldering pen hard when soldering! Gently force the nickel sheet to the battery! Welding is not strong enough! You can try your hand more to find the right pring force! The 0.1 nickel chip sent is just 2.3 gears. You can also try different gears! Package List 1 x Spot Wedler 2 x Quick Release Pen 1 x USB Charging Cable