1) 0.91 inch OLED screen, various data display 2) 1-20 gear power adjustable 3) Intelligent regulation charging (MAX2A) 4) USB 5V output (MAX2.4A) can charge Android phones 5) Touch the button panel, data adjustment is more convenient The main parameters: Name: Spot Welder Material: metal shell Battery capacity: 5500mAh Welding output: 4.2V MAX 650A USB output: 5V MAX 2.4A Charging port: Type-c Spot welding power setting: Starting from the first gear, slowly increase the power until it can be welded. Do not increase the power if you can weld. Avoid MOS bombs. Black solder joints indicate that the power is too high. When soldering, gently press down on the soldering pin, the nickel sheet and the battery can be bonded together. The harder you press, the weaker the welding will be. It will automatically trigger after pressing for one second. Adapter selection requirements: The adapter needs to be 5V, 2A or greater. USB output port description: Due to the different internal circuits of the spot welding machine, there may be compatibility issues with the iphone charging, so the iphone cannot be charged temporarily. If you need to charge the iphone, you can short-circuit the 2 and 3 of the usb output port. Android phones have different charging protocols, so it is currently not possible to support all fast charging protocols. Package List: Mini Spot Welder*1 Soldering pen*1 0.12*8*200 nickel-plated steel sheet*1 English manual*1 Type-c charging cable*1