Specifications: The user needs to provide 12V battery power, and the welding current is about 90A 130A. A battery that can start a car can essentially meet the power requirements of the circuit. It is forbidden to use farad capacitors for power, and it is forbidden to use batteries with 60A and above. Item Name: Printed Circuit Board Material: PCBsystem Voltage: 12V-14.6V (Capacitance X Rate = must be greater than 150A)Current Requirement: 150A or above instantaneous output Features: durable, heat-resistant, welding tool Size: 12cm x 9x2cm/4.72" x 3.54" x 0.79" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included:1 x Circuit Board2 x Input Line2 x Output Line2 x Welding Pen1 x Nickel Strip6 x Copper Wire Eye4 x Screw2 x Heat Shrink Tube