Support multiple communication modes: Modbus protocol supports server, client, UDP mode, UDP multicast, HTTP and MQTT, supports Modbus RTU protocol and Modbus protocol. Multiple configuration methods: support software configuration, Web browser configuration, support DHCP to dynamically obtain IP, DNS protocol to connect to domain name server address. Multiple power supply methods, wide voltage input: power plug type: directly use the power plug for power supply terminal power supply: DC7V-36V wide voltage range input Ethernet PoE power supply: applicable to IEEE 802.3af PoE standard. Support network port cascade communication and PoE cascade power supply: onboard 2 network ports, both can be used for network port communication and cascade, one can be connected for dual serial port server network port communication, the other can be used for cascade or networking other devices. Guide rail housing design: ABS protective housing, easy to install and use, with housing Name:Relay Module Color:Black Material:ABS Package Contents: 1 x Relay Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.