using the photoresistor induction light intensity comes with the relay, direct control load Distribution bit sensitivity adjustment, start relay threshold set by adjusting potentiometer, when the dark this threshold, the module relay is energized, bright this threshold, the relay release; 12 V power input is designed for relay board regulator transistor to provide sensor Used to make the product more stable and reliable; onboard optocoupler isolation drive relay, the effective protection of the chip to make the product more reliable work; has four fixed bolt hole for easy installation XH-M131 DC 12V Light Control Switch Photoresistor Relay Module Light threshold can be adjusted by potentiometer to set the relay start Input: 12V Load capacity: 10A / AC 250V or DC up to 30V RED LED ON: Indicate the Power ON BLUE LED ON: Relay is working Module output terminal has three ports Normally open ( NO ) Common terminal ( COM ) Normally closed ( NC ) Size: 30MM*53MM colour:blue Material:pc Package Contents: 2 * Photoresistor Relay Module(If the number of products received is incorrect, please contact us . we will refund or give you a replacement)

We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Package Contents: 2 * Photoresistor Relay Module(If the number of products received is incorrect, please contact us . we will refund or give you a replacement). Load capacity: 10A / AC 250V or DC up to 30V. Input: 12V. Light threshold can be adjusted by potentiometer to set the relay start.