Features: 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. 100% brand new and high quality If you have any questions, please feel free to contact us. Made of high quality ABS Material, durable and firm. 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 as18650 lithium battery nickel plating 0.15 and 0.2mm steel sheets, transformer above500W can be welded directly. This module includes main board and display board, optional 40A and 100A bidirectional silicon control tectifier, does not include welding transformers, welding pen and other matching tools. Package Includes: 1 x Welding Machine Transformer Controller Board Time Control Module Specifications: Material: ABS Size: 9 x 4.5cm/3.54x1.77inch Current: 40A/100A(Optional) note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you place order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!