SainSmart iMatic 16 Channels Relay I/O Remote Control Controller Module, RJ45 Interface, Compatible with Arduino, Android iOS Device Control Under WiFi Connected Network (Controller Module + 16-CH Relay) Control switches remotely together with 16 Channel relay! RJ45 interface, via RJ45 telecommunications connection for network control. Support for 16 Channels relay which means you could controll more to 16 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