SainSmart iMatic V2 16 Channels Relay I/O Remote Control Module, Compatible with Arduino, Android iOS Device Control Under WiFi Connected Network (Controller) Control switches remotely together with 16 Channel relay! Support 16 Channels relay, you could controll up 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. The 16-CH Relay(optional) is able to control various appliances and equipments with large current.