Features: Compact size and light weight, the spot welding machine is portable to carry and store. The housing is made of hard aluminum alloy material, with fine workmanship, featuring wear resistance and long service life. Built-in 6*300A high-power MOS tube on both sides, the theoretical maximum can withstand 1800A peak current, large margin & low failure rate. The OLED color screen displays delay time, power gear, remaining electric quantity, battery voltage and charging input current. Each welding pen is consist of 8awg 300mm cable and 6mm diameter solid aluminum oxide copper penhead, low resistance & fine electrical conductivity & support large current. It is recommended to use 0.1~0.15mm nickel strip or nickel-plated steel strip for spot welding, with good effect and high strength. The product will automatically power off to save power if it is not used for 5 minutes. 20-Gear Delay Time Adjustment: The range is 0.5 seconds to 2.5 seconds. In the power-on state, press MENU (red button) until the delay number is highlighted, and then press V+/V- (black button) to adjust the delay time. It determines the delay time when the soldering pen automatically welds the metal. 20-Gear Power Adjustment: The range is 1-20. In the power-on state, press MENU (red button) until the power number is highlighted, and then press V+/V- (black button) to adjust the power range. The larger the number, the higher the spot welding power. Specifications: Material: Aluminium Battery Capacity: 10600mAh Internal Resistance of Battery: 0.5 milliohm Spot Welding Current: 600A~800A