We have commodity security services. If the product you received has quality problems, please feel free to contact us, we can provide you with a return service.The most important features of this controller:1: the use of STM8 industrial microcontroller control center.2: strong and weak electricity via optocoupler insulation, safe operation.3: the power line and the foot switch line adopts the screw free fast connection terminal, more convenient and reliable.4: input time, current using high-precision single potentiometer, reliable input, convenient5: on-board power supply, state, foot, trigger indicator, working state clearly visible.6: the design of reliable zero-crossing detection circuit that the SCR phase shift accuracy.7: the controller is compatible with 40A scr.8: digital control interface, you can view the current time and current settings.9: time input 1-50, unit cycle (1 cycle is 20 ms)colour:redMaterial:plasticPackage Contents:1* NY-D01 40A Digital Display Spot Welding Machine Transformer ControllerOnly the above package content, other products are not included.Note: Light shooting 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.