The photocell switch is an automatic control of the lighting time according to the illumination value of the environment. Saving energy, long life, safe and reliable.(When using, please pay attention to the wiring method in the picture, otherwise it will not work) Using three-wire system, compatible with resistance. It has the characteristics of saving energy, long life, safe and reliable.(1.The positive pole of the white line input(+) 2.Black line neg ative input (-) 3.White line and red line for load 4.White lines are common lines) The internal environment with automatic illumination detection circuit, shut down during the day and open during the night automatically. Control of the lighting time according to the illumination value of the environment automatically. Suitable for the LED lighting and outdoor monitoring, advertising gallery, garden lights and other automatic switching lights control.(Please pay attention to the correct connection of all cables when installing)