4: input time, current using high- single potentiometer, to reliable input, convenient 3: the power line and the foot switch line adopts the screw free fast connection terminal, more convenient and reliable. 2: strong and weak electricity through optocoupler isolation, safe operation. 1: the use of STM8 industrial microcontroller control center. 5: on-board power supply, state, foot, trigger indicator, working state clearly visible., Weight: 0.20172296973 pounds, Manufacturer: Tuidzljd