Usage Tips:Features: Accurate zero crossing detection triggering designed to achieve precise control. Optocouplers isolate strong and weak electricity for more reliability operating. Comes with time and current adjustment knob, turn left to decrease the value and right to increase it.LCD digital screen displays current set time and current. Time range 1-50 cycles, 20 milliseconds per cycle, current range 30-99%.If there is a sudden power outage or shutdown during the welding process, the welding parameters will be automatically saved. After the next startups, it can be used directly without the need for re debugging.The power cord and switch cable rack adopt screwless quick connection terminals for more convenient operatingSpecifications: Component:ABSCurrent:100A/40ASize:Approx.6x4cm/2.36x1.57inchPackage Includes: 1 Set Spots Welder Control Boardnote: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.