LCD digital screen displays current set time and current. Time 1-50 cycles, 20 milliseconds per cycle, current 30-99%. Accurate crossing detection triggering designed to achieve precise control. Optocouplers isolate strong and weak electricity for more reliability operating. If there is a sudden power outage or shutdown during the welding process, the welding parameters be automatically saved. After startups, it can be used directly without the need for re debugging. Comes with time and current adjustment knob, turn left to decrease the value and right to increase it. The power cord and cable rack adopt screwless quick connection terminals for more convenient operating, Manufacturer: Akfldms