Feature: 1. . A 25V 10000uF high‑frequency low‑resistance capacitor is added to the power input for energy compensation, which increases welding stability. 2. The power board uses 2 Gusi copper to increase the overcurrent capacity. Using 5 300A MOS tubes, non‑disassembled MOS tubes. 3. The MOS tube driver adopts the imported special chip driver. The fastest MOS tube can be hit with 20nS. The switch is fast to prevent the explosion of the tube and the non‑triode push‑pull drive. 4. The MOS drive design adds a transient diode to protect the MOS and prevent the explosion of the tube. 5. 10AWG multi‑filament flexible wire is used for the welding pen line and the input line to increase the overcurrent capacity. Specification: Item Type: Spot Welding Machine Material: ABS+Metal Color: Red+Blue+Black Input Line Length: Approx.20cm/7.87in Length of Welding Pen: Approx.30cm/11.81in Battery: Lithium battery(not included) Quantity: 1 Set Weight: Approx. 207g / 7.3oz Package List: 1 x Controller(Battery Not Included) 1 Pair of Welding Pen 1 Pair of Power Input Line(Red and Blue) 1 x Power Access Plug Note:1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. Spot Welding Machine Set only, other accessories demo in the picture is not included.