This is an Ethernet Controller board which could be compatible with the 16-channel relay. Using the controller module and the 16-channel relay, you could control up to 16 devices remotely on LAN or WAN. The Ethernet controller board has integrated the web server, when you are in office, you just need to open the page on your computer, pad or smart phone, and then control your devices like lights, air-conditioning or refrigerator at your home. You can to enjoy the remote controlling of your other devices with the Ethernet controller board.RJ45 interface, via RJ45 telecommunications connection for network control. Unique dual connect control, corresponding with above trait, local as server, accept client control when connect to remote server as client. Relay Size: 18*10*4cm/7.08*3.93*1.57 inch Default IP: 192.168.1.4 prot:30000 httpss://192.168.1.4/30000 (You could change the default IP address) https Comment: https://192.168.1.4/30000/00 : Relay-01 OFF https://192.168.1.4/30000/01 : Relay-01 ON https://192.168.1.4/30000/02 : Relay-02 OFF https://192.168.1.4/30000/03 : Relay-02 ON https://192.168.1.4/30000/04 : Relay-03 OFF https://192.168.1.4/30000/05 : Relay-03 ON https://192.168.1.4/30000/30 : Relay-16 OFF https://192.168.1.4/30000/31 : Relay-16 ON https://192.168.1.4/30000/41 : Enter https://192.168.1.4/30000/40 : Exit https://192.168.1.4/30000/42 : Next Page https://192.168.1.4/30000/43 : Next Page Colour:blue Material:plastic Size:18*10*4cm Package Contents: 1* 16 Channel Relay Only the above package content, other products are not included. Note: Light 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.