1、Photosensitive Resistor Module - Stable and reliable quality. 2、Diode protection - The power supply part has diode protection, filter capacitor and anti-interference capacitor and 7805 voltage regulator chip, which can provide stable voltage and prevent the power supply from being reversed, and burn out the module. 3、Equipped with a precision adjustable potentiometer to better adjust the sensitivity and delay time. 4、There is a power indicator and a relay pull-in indication. 5、Equipped with a high-power relay to control the 10A current load. What this photosensitive resistor module can do: Automatic light detection, brightness detection, potentiometer can adjust the detection brightness valve point, and bring its own relay and delay function. When the light is darker than the brightness adjusted by the potentiometer, the relay switch is automatically turned on, and the light detection alarm can be done. , light control delay switch, brightness detection switch, can control various street lights, automatically turn on at night, automatic extinguishing during the day and auto headlights, stage lighting, LED lighting, traffic light detection switch, product with delay adjustable and adjustable light sensitivity Function, light sensing without flicker. Features: Photosensitive Resistor Module - Stable and reliable quality. Equipped with a precision adjustable potentiometer to better adjust the sensitivity and delay time. There is a power indicator and a relay pull-in indication. Equipped with a high-power relay to control the 10A current load. The module comes with a 50cm long photoresistor sensor. Comes with delay, which can adjust the delay time to solve the problem of the flashing of the relay at the critical point of the light. Specification: Type: XH-M131 Photosensitive Resistor Module Power supply: DC5V / DC12V Quiescent current: 12mA / 15mA Power consumption: 72mA / 45mA Ambient temperature: < 80℃ Weight: Approx. 28g Size: Approx. 53 * 30 * 18.5mm / 2.1 * 1.2 * 0.7in Package list: 1 * XH-M131 Instructions: 3. Delay adjustment method: The time range of plugging the jumper S2 is 1-20 seconds, the time is not inserted is 1-200 seconds, the delay potentiometer will adjust the clockwise time longer, the reverse time will be shorter, when the sensitivity is adjusted , must adjust the delay to the shortest delay time of about 1 second (counterclockwise adjustment of about 10 circles); 4. Adjusting the sensitivity of the sensor: Adjust the sensitivity potentiometer in the light environment. If the sensor is used to cover the sensor head, the relay will pick up, let go of the delay and the relay is disconnected, and the module has the sensing function. If you want to adjust the sensitivity, adjust clockwise, the more sensitive the induction will be, the adjustable light will start the relay when it is dim, and the counterclockwise will adjust to the time when the light is in the relay, the relay will not pick up. 5. Delay time adjustment method: When clockwise adjustment, the delay time is extended. Note: This connection can NOT be inserted into jumper S1, otherwise the module will be burned out.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.