Features: All-digital circuit, new zero-crossing detection circuit, accurate current and time control. Compatible with 50Hz and 60Hz power supplies, the controller automatically judges. Current regulationrange 30%-99%, time controlrange 1-99 cycles (1 cycle = 20ms). 2pcs 0.56inch high brightness digital tube display. Press the button to adjust the parameters, the operation is more convenient. Display panel contains status light and buzzer, instructions are more intuitive. Easy to install, convenient for customers to install and produce spot welders. Multiple strands of high temperature silicone wire with fine torsional resistance ability, fine conductivity and reliability, with a strong overload bearing capacity. Comes with a quality foot pedal, wear resistant and can provide long service time.