Feature: 1. Welding Pen: The welding pen has a length of 40cm, flexible and easy, gold plated terminal can pass higher current, 7mm spot welding copper, ultra low resistance and oxidation resistance. 2. 5000mAh Battery: This spot welder has a 5000mAh high capacity battery, a discharge current of 500A, 5V 2.1A Type C input, can be fully charged within 2 hours, and can also charge other devices. 3. Circuit Protection: This spot welder has over charging and over temperature protection, automatically cutting off the power supply when overheating, and automatically shutting down without any operation. 4. 4 Gears Adjustment: This portable spot welding machine supports 4 gears adjustment, long press to turn on or off the machine, and short press to switch gears to meet more welding needs. 5. Other Functions: When the welding pen is connected to the nickel sheet, the MOS tube will automatically output, equipped with indicator, which will automatically turn off at low voltage to protect the battery. Specification: Item Type: Spot Welder Model: SW-100 Battery Capacity: 1 x 3.7V Polymer Lithium Battery 6060100 5000mAh (built in battery) Output Voltage: 4.2V Maximum Output Current: 500A Maximum Design Current: 1000A Maximum Input Parameter: 5V 2.1A Support Welding: 0.1-0.15mm Nickel Sheet, Iron Sheet, Stainless Steel Welding Time: Several Milliseconds Charging Voltage: 4.5-5.5V (current ≥2.5A) Product Size: Approx. 150 x 80 x 22mm / 5.9 x 3.1 x 0.9in Application: Suitable for daily household or small amount of spot welding and touch welding work, automatic triggering without switch, convenient and fast operation.. Package List: 1 x Spot Welder2 x Welding Pen1 x USB Charging Cable Note: 1. It can run while charging, and enter standby mode when charging2. It is recommended to charge it once every six months when it is not used for a long time, and charge 75%3. Continuous use of welding pen will be hot situation, it is recommended to wear gloves operation4. Do not drop, water immersion, heating and other electronic harmful operations5. The black front end of the pen will affect the effect and can be sanded away6. If spot welding is too long or good contact leads to shutdown, restart