0,91 inch OLED screen, various data displays. 1-30 Transmission power adjustment. Starting from the first gear, slowly increase the power until you can weld. Black solder connectors indicate that the power is za large. Supports 0,1-0,15mm nickel sheet welding and supports 0,2mm nickel sheet welding when fully charged. One-piece welding needle, gold-plated pen tip, copper pen housing, oxidized copper welding needle, very low resistance, anti-oxidation. Safe and durable, numerous protections, improve the heating of the battery and prolong its service life. Im harder you press, the weaker the weld will be. It will start automatically when pressed and held for one second. Description of USB output port: Due to the different internal circuits of the spot welding machine, there may be problems with the compatibility of charging the iPhone, so it cannot be charged temporarily. If you want to charge your iPhone, you can short-circuit 2 and 3 USB output ports. Specification: Material: metal housing Battery capacity: 5500 mAh Welding output: 4,2 V max. 650 A USB Output: 5 V max. 2,4 a Charging Port: Type C Requirements for selecting an adapter: 5 V, 2 A or more Package includes: 1x Spot welding machine 2x soldering iron 1x nickel sheet 1x Type-C charging cable 1x instruction