99 gears adjustment digital tube real-time display, gears 0-99, 1st is the lowest, 99th is the highest, and the gears are increased in turn. Using 5 MOS tubes, the control board of the spot welding machine adopts 5 MOS tubes, and the theoretical maximum current can reach about 1700A after 5 parallel connection. 8 spot welding pen 10AWG wire, aluminum oxide copper spot welding needle, to excessive current capacity and durability, greatly the efficiency of spot welding. Upgrade to an automatic trigger design, no need to press for a long time, completely free your hands. Lightweight and portable, stable and reliable, wear-resistant, long service life. Product name: K99 spot welding machine Working voltage: 6.5V-16V Working current: Less than 20ma Standby consumption: Less than 0.5ma Recommended operating temperature: -10-60C Voltage: 12V Product size: 90x60mm Welding current: 1700A MAX Welding brocade thickness: 0.1-0.3mm (related to battery discharge energy) Capacity: 20AH-80AH (the new battery does not exceed 45AH, if it exceeds 45AH, please contact our customer service to inquire about the current limiting ) or: 4-5 strings of super capacitors Prohibition: It is forbidden to switching supply, transformer, charger, appliance, water battery, bank to supply ! Colour:As shown Material:PCB Package Contents: 1 x Control Board 2 x 10AWG Input Cable 2 x Spot Welder Pen 2 x Heat Shrink Sleeve 6 x Screw 1 x Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.