Most Of The Small Spot Welding Machines On The Market Are Second-Hand Mos Tubes Obtained By Disassembling The Machine. The Quality Cannot Be Guaranteed. The Tubes Often Explode, And The Welding Is Not , Or Even Cannot Be Used At All. Spot Welding Machine Does Not Use Mos Tubes, Innovatively Uses High-Power Relays, So That The Instantaneous Current Of The Relay Can Reach 1500a. It Not Only Has Stable Quality, Also Has Welding Effect Adjust Slowly From The When Using, And Do Not Increase The Gear After The Spot Welding Is When Spot Welding, Keep The Contact Surface Between The Nickel Sheet And The Battery Electrode Flat, And Touch Lightly When Spot Welding Notice: 1. Use A Battery With A Continuous Current Of 7-17v To 200a-1500a To Power The Spot Welder, Otherwise It Will Cause Damage To The Motherboard 2.Do Not Use Alligator Clips To Connect The Spot Welder 3.The Length Of The Power Cord Is About 25 Cm. Extending The Power Cord Will Weaken The Spot Welding , Or Even Make Spot Welding Impossible Style:C:car treasure Colour:As Shown Material:Aluminum alloy + plastic Size:3x2cm Package Contents: 1 Set * Relay Spot Welder Kit 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.