Adopts 5pcs MOS tubes, and the max current is up to 2390A. High power output design, 99 gears of output power adjustable, more accurate welding, and it can continuously welding thousands of points on nickle/nickelplate sheet. The welding is based on the principle of high-current and high-temperature rapidly melting the part of nickel sheets and cooling. Equipped with 2pcs copper bars, which are greatly increase the overcurrent capacity. The welding spots are accurate and beautiful, support welding 0.05-0.3mm nickel sheet, iron sheet, stainless steel sheet. This spots welding machine can be used to spots welding cylindrical lithium batteries and nickel-metal hydride batteries like 14650/17490/18650/21700/26650/32650 and etc.. Specifications: Name: Spots Welding Machine Control Board Type: A / B / C Material:plastic colour:As Shown Package Contents: 1 x Spot Welder Machine 2 x Spot Welder Pen / 1 x Spot Welder Control Board / 1 x Spot Welder Machine 2 x Spot Welder Pen 1 x Case Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.