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.