1、Can be used for light detection, brightness detection, and is equipped with a power indicator (red) and a relay pull‑in indicator (blue). 2、This photoresistor relay module has four M3 screw mounting holes, which greatly facilitates installation. 3、Using sophisticated production technology, and the sensitivity of light can be adjusted through a potentiometer. 4、Can be used as a control switch for various brightness detection, which can be used in street lights and other equipment that needs automation. 5、Made of high-quality materials, this module is sturdy, durable, not easy to wear, and has a long service life. Item Type: Photoresistor Relay Module Model: XH-M131 Working Voltage: 5V Output Mode: One Output Sensor Cable Length: Approx. 30cm / 11.8in Machine Size: Approx. 53 x 31 x 19mm / 2.1 x 1.2 x 0.7in 1 x Photoresistor Relay Module 1 x Light Sensor