Digital display control board is suitable for personalization: Rated voltage, secondary voltage, rated power. Welding Control Board consists of the main board and display board, featuring a 40A bidirectional thyristor, excluding the welding transformer, welding pen, and other supporting tools. The Spot Welder Control Board has a grid voltage compensation function that can automatically adjust the compensation output according to changes in the power supply. Spot Welder Module is designed for DIY or simple battery welding machines, primarily used for welding single batteries or battery packs. Welding Control Module isolates strong and weak currents using optocouplers, ensuring reliable zero-crossing detection and voltage detection circuits for accurate phase shift of the controlled rectifier. Material: plastic, metal Colour: Green Package Contents: 1 x Double pulse spot welding machine control module Only the above package content, other products are not included. Note: Lighting and different displays may cause the item's color in the picture to differ slightly from the actual product. The measurement allowed error is +/- 1-3cm.