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 Applicable battery: Car starting battery:The output interface of the starting battery must be EC5, and the current is 1500A 1. Gear adjustment: Rotate the encoder to adjust the gear position (the number is flashing), click the encoder to select 'confirm' (the number is long bright, it is the welding state), the gear is 01-199 2. Switch machine: Press and hold the encoder for 3 seconds to power on or off 3. Warning: For the first use, debugging from the , and slowly increase the gear. After adjusting the appropriate gear, do not increase the gear at will, so as not to burn the motherboard if the gear is too Spot welding skills: 1. adjust slowly from the when using, and do not increase the gear after the spot welding is 2. When spot welding, keep the contact surface between the sheet and the battery electrode flat, and touch lightly when spot welding Colour:black Material:metal+plastic Package Contents: 1 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.