1. The module is powered by 12V and has an anti-reverse connection function. Reverse connection of the power supply will not damage the module; 2. The maximum load capacity of the normally open interface: 0V--125V/20A, 0V--14V/20A; the module output has three ports: common (COM), normally open , and normally closed (CB). The three ports are equivalent to a double-control switch. When the relay coil is energized, the common terminal is connected to the normally open terminal. When there is no electricity, the common terminal is connected to the normally closed terminal; the COM terminal is generally connected to the negative pole of the power supply through the load, and the normally open terminal is connected to the positive pole of the power supply; 3. The sensitivity can be adjusted through the potentiometer. By adjusting the potentiometer, the start relay threshold is set. When the light is darker than this threshold, the module relay is energized, and when it is brighter than this threshold, the relay is disconnected;