Features: brand new and high quality The control panel of the spot welding machine is a controller which is independently developed for the DIY or the simple resistance welding. The principle of silicon controlled phase shifting triggering is adopted to adjust the for time and the current to achieve the purpose of welding. Strong and weak electricity through optocoupler isolation, safe operation. Power cord and foot switch line with screw-free quick connect terminal, more convenient and reliable. Input for time, current using high-precision single-bit potentiometer, to ensure reliable and convenient input. Specifications: Material:ABS Type:40A100V/100A110V/40A220V/100A220V/40A 110V Foot Switch/100A110V Foot Switch/40A220V Foot Switch/100A220V Foot Switch(Optional) Size:17.5x9.5cm/6.88x3.74inches Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 1 Set Spot Welding Machine Control Board