Sonoff, a (smart) wifi switch, which you can buy for appr. 6 dollars on several Chinese websites. Sonoff is a cost effective smart home solution designed and produced by ITEAD. Sonoff is a ESP8266 based WiFi wireless switch that can connect to appliance of different types and brands.
Standard it will be delivered with a Chinese app, which means the ‘cloud’ is necessary to operate this device. I don’t like the cloud when it comes to control and or monitor my smart home. I did a search on the internet en some guys were able to flash the ‘esp easy’ firmware to it 🙂