Compatible with 100A SCR Can adjust welding time to point and current solder point, 0.020.1 s range, current 40% 100%, left front button to adjust the time, the right button to adjust the current. for safety reasons, adjust the current knob to the custom plastic handle of the potentiometer, the torque pot slightly smaller Connecting foot switch with the city insulation, even if the pressis safe The pedal switch does not matter how long can only solder to point once, second in the spot welding need to drop to Increase the anti shake circuit breaker to prevent the foot when the switch when the jitter caused by welding to the point of contact switch new Voltage: 220V colour:Green+black Material:ABS+metal size:78 x 50mm / 3.07 x 1.97inch Package Contents: 1 x Control Board Time Relay Only the above package content, other are not included. Note: Light 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.