Accurate 0 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 will be automatically saved. After the next startups, it can be used directly without the need for re debugging LCD digital screen displays current set time and current. Time ranges 1-50 cycles, 20 milliseconds per cycle, current ranges 30-99% Comes with time and current knob, turn left to decrease the value and right to increase it The power cord and switches cable rack adopt screwless quick connection terminals for more operating, Manufacturer: REITINGE