Features: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 hasintegrated the web server, when you are in office, you just need to open the pageon your computer, pad or smart phone, and then control your devices likelights, air conditioning or refrigerator at your home.You can enjoy the remotecontrolling of your other devices with the Ethernet controller board.RJ45 interface, via RJ45 telecommunicationsconnection for network control.Specifications:Relay Size: 18*10*2cm/7.08*3.93*0.79"Package Includes:1 x Ethernet Control Module with 16-Channelrelay.