Features: brand new and high quality The spot welder- control module is developed for DIY or simple battery welder-. It is mainly used for single battery or battery group nickel plated sheet welding, such as 18650 lithium battery nickel plating 0.15 and 0.2mm steel sheet, 500W transformer can be welded directly. It is intended to weld other battery materials and different thickness, such as polymer battery electrode without nickel plating, must be combined with sufficient power transformer to weld. Can be set to save the last operation, the module double pulse trigger, turn off any set of trigger for time, you can change double pulse to single pulse trigger. Multi-group data 12864 visual display, intuitive operation, convenient, single encoder parameter adjustment can make the operation simple and fast. With 0-9999 welding counting function, with 5 groups of sample storage parameters, can be stored even the electricity power is off, the number of wleding could be seen just by a glance. Specifications: Current: 40A / 100A(Optional) Display: 12864 LCD Display Display Board Size: 85 x 45mm/3.39x1.77in Main Board Size: 85 x 45mm3.39x1.77in Package Size: 10 x 9x 2cm/3.93x3.56x0.79in Package Weight: 74-86g Package Includes: 1 x Main Board 1 x Display Board 1 x Cable note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. The module has the network voltage compensation function, so the voltage calibration must be carried out when the first machine is installed, and in the future, as long as the module power transformer is not replaced, there is no need to recalibrate. Of course, when you feel that the display voltage is wrong and it can be calibrated.