ESP8266-01 wifi relay module is a smart way to start building your own smart iot appliances ...you can start falshing and coding the esp8266 according to your needs and control lights, cooker, heater, drip irrigation from esp8266 module from anywhere anytime by using the web interface or the app written by you...its the fastest and quick way to get your work done....Wifi Single Relay 2A SSR Board for Home Automation with Android App

This is a single Solid State Relay(normally open) board which has esp8266-01 on board and also has 100-230VAC to 5VDC converter on the same board. Can be programmed for Mqtt.