1,Trigger Button: Handheld spot welding pen has a trigger button, press to weld once, very convenient, built in LED indicator. 2,Voltage and Current: Automatic trigger handheld spot welding pen wire specifications for 12AWG silicone wire, using voltage of 12V‑16.8V, spot welding current of 80A‑150A. 3,Size: The main body of the soldering pen is 25x170mm, the length of the wire is 350mm, and there are 3x1.5x40mm professional aluminum oxide copper alloy soldering needle, suitable for 18650 or 21700 battery pack. 4,MOS Tube: Our automatic trigger handheld spot welding pen has a built in MOS tube, which can carry 550A current, integrated design, and can be used when connected to a battery. 5,Stepless Adjustment: The auto trigger handheld soldering pen is removable and replaceable, 99 levels of stepless adjustment, more convenient to use.