Introduction - If you have any usage issues, please Google them yourself
1: SCM the timer generates seconds signal alternately turned on and off, control the red, green and yellow of the crossroads,
2: 4 LED digital tube display the remaining time of the crossroads of two directions. Requirements can use the button to set the two directions of travel time (green light time) and suspend the passage of time (yellow light time).
3: The system shall conform to the requirements of the general traffic light control.