Features:_x000D_ _x000D_ This switch uses photoresistor to sense intensity of light and good quality relay can directly control load. _x000D_ Adjust potentiometer to change sensitivity and set relay start threshold; when it is darker than the threshold, relay is energized; when it is brighter than the threshold, relay is de-energized. _x000D_ 12V power supply input special for relay, designed with 78L05 regulated transistor, more stable and reliable. _x000D_ Optical coupling isolation drive relay can effectively protect chip and ensures a better performance. _x000D_ Widely used for light detection, brightness detection, all kinds of light detection switch, controlling street lamps, and automatic equipment. _x000D_ _x000D_ Specification:_x000D_ Voltage: 12VDC_x000D_ Current: >100mA_x000D_ Load Capacity: 250V 10A AC; Or 30V 10A DC_x000D_ PCB Size: 5*2.6cm/1.96*1.02"_x000D_ _x000D_ Instruction:_x000D_ 1, Photosensitive resistance module is sensitive to ambient light, commonly used to detect the brightness change of ambient light._x000D_ 2, Relay module is energized when ambient light is darker than set threshold; COM and NO terminals are connected. Relay module is de-energized when ambient light is brighter than set threshold; COM connect to NC terminal._x000D_ _x000D_ 3, COM, NO and NC terminals are equivalent to a three-way switch. When relay coil is energized, COM is connected to NO terminal. When coil is not energized, COM is connected to NC terminal. _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Photoresistor Switch