Features: brand new and high quality The spot welder control module is developed for DIY or simple battery welder. It is mainly used for nickel plating welding of single battery or battery pack. For welding other battery materials with different thickness, such as polymer battery electrode without nickel plating, it must be combined with enough power transformer to weld. This module includes motherboard and display board, optional 40A and 100A bidirectional SCR, excluding welding transformer, welding pen and other supporting tools. You can save the last operation, monopulse triggers this module. Suitable for DIY or simple battery welder development welding, welding of a single battery or battery pack. Package Includes: 1 x LCD Digital Double Pulse Encoder Specifications: Material: Copper and Plastic Type:Electric Current 40A/100A Size:9x4.5x1.5cm/3.54x1.77x0.59inches note: Please allow 0-1mm errors due to manual measurement, make sure that you do not mind before you order.