Features 1、Sensitivity can be adjusted through the potentiometer, with a relay, can be used as a variety of height detection control switches. 2、Can be used for light detection, brightness detection, with power indicator (red) and relay pull indicator (blue). 3、Easy to install, easy to use, with four M3 screw mounting holes, which greatly facilitates installation. 4、Sensitive to ambient light, can be used to detect the brightness changes of the surrounding ambient light. 5、Used for street lights and other equipment that needs automation. It automatically turns on at night and automatically turns off during the day. Specification Item Type: Light Control Relay Module Model: XH-M131 Working Voltage: 12V Output Mode: One Output Sensor Cable Length: Approx. 30cm / 11.8in Product Size: Approx. 53 x 31 x 19mm / 2.1 x 1.2 x 0.7in Package List 1 x Light Control Relay Module 1 x Sensor line