Features: brand new and high quality 1: All-digital circuit, new zero-step detection circuit, accurate current and for time control. 2: for 50HZ and 60HZ power supplies, the controller automatically judges 3: Current adjustment range 30%-99%, for time control range 1-99 cycles (1 cycle=20ms) 4: Two 0.56 inches high brightness digital tube display 5: Press to adjust the parameters, the operation is more convenient 6: The display panel contains status lights and buzzers, making instructions more intuitive 7: Easy installation, convenient for customers to install production Spot Welders Note: Both LEDs are red Specifications: Material:ABS Style A: 100A board+AC220-9V+ Film Style B: 40A board+AC220-9V+ Film Style C: 40A board + AC110-9V +Film + Pedal Style D: 40A board + AC220-9V + Film + Pedal Style E: 100A board+AC110-9V+ Film Style F: 40A board+AC110-9V+ Film Style G: 100A board+AC110-9V+ Film Style H: 100A board + AC220-9V + Film + Pedal Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Spot Welding Machine Control Board