SainSmart iMatic 8 Channels Relay I/O Remote Control Controller Module, RJ45 Interface, Compatible with Arduino, Android iOS Device Control Under WiFi Connected Network (Controller Module) Control switches remotely together with 8 Channel relay! RJ45 interface, via RJ45 telecommunications connection for network control. Support for 8 Channels relay which means you could controll more to 8 different devices at the same time. Unique dual TCP connect control, corresponding with above trait, local as TCP server Accept client control, when connect to remote server as TCP client