Cloud server, WI-FI router, Mobile equipment and WiFi Plugtop are absolutely necessarily equipments;
The control way is, apps send the signal to cloud server, cloud server translate the directive and forward to wi-fi plugtop through wi-fi router. The end wi-fi plugtop perform the directive. The Wi-fi plugtop can perform ON or OFF directive, ON is meaning contact the power between electrical appliance and power supply. OFF is vice versa.