Description/Features: The voltage is 4-12V and the current is more than 800A. The thick wire is connected to the copper column and the spot welder is connected. The small wire is the switch wire. Contact the switch of the spot welding machine, the small wire can not use the copper sheet of the spot welding machine. Don't connect it wrong, otherwise the small wire burn Specifications: Color: green and blue Material:Aluminum copper alloy Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 2 x Spot Welder Pen 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.