Foot switching interfaces: standard DC5.5-21mm socket, compatible for foot switches and integrated handheld spots welding pens Communication: XH2.54-4P, TTL 3.3V output, 5V power output, providing a most current of 500mA Soldering pen wire: 10mm² clear flexible copper wire, copper pen body, quick-changes pen tip, compatible for 3mm diameter soldering pins, and most supported length is 100mm External temperature interfaces: universally 10K thermistor ( B3950 model), XH2.54-2P connector Recommended power supply: 12V car battery ( 20AH-75AH), car starting power supply ( starting boosters), 2-4S battery, 2-3S super capacitor, ( The charging voltages of 4S capacitor is about 9V), 2-3S high rate model battery ( without protections plate) or single cell battery; Spots welding current: 6low-resistance 600A current MOSFETs, the welding spots current can reach 2600A, Manufacturer: JDNH