1. Portable Spot Welding Machine, Automatic Power Off, Can Spot Nickel Strip Thickness 0.1-0.15mm 2. If The Welding Pen Is Short-Circuited, It Not Damage The Circuit, But The Short-Circuit Current Is Very Large, Which May Affect The Battery Life. 3. With Power Bank Function; It Also Supports Spot Welding While Charging, Greatly Improving Work Efficiency. 4. Make Sure The Battery And Nickel Plate Are Clean And -Free. The Of The Nickel Plate Is Flat. 5. Support Welding , , And Other Mainstream Mobile Phone Batteries Model: DH30 Bottom Introduction Output Voltage: 4.2V (Maximum) Output Current: 650 A (Maximum) Design Current: 1200 A Top Introduction Turn On: And Hold The Power For 3 Seconds To Turn On Close: Long Energy Closes In 3 Seconds Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Colour:As Shown Material:Aluminum Alloy Package Contents: 1 x Spot Welding Machine 2 x Spot Welding Pen 1 x Nickel Sheet 1 x Charging Cable 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.