DIY 12V spot welding machine PCB circuit board, 18650 lithium battery assembly control board,Portable, stable, reliable and System voltage: 12-14.6v Working current: 90-150A Spot welding board control instructions: 1. Button function: long for 3 seconds to switch between 1st power level, 2nd power level, 3rd power level and 4th power level, 2. Green light flashes once (outputs a low-power spot welding pulse every 3 seconds or so), green light flashes twice (outputs a medium-power spot welding pulse every 3 seconds or so), green light flashes three times (outputs a high-power spot welding pulse every 3 seconds or so), red light is always on (4-level power automatic spot welding, for about 1 second to spot weld once), 3. The buzzer sounds briefly for each spot welding output. The indicator light flashes green once Color: As Shown Material: PCB Package Contents: 1set x spot welder circuit board accessories 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.