One of the brands with more economic devices for home automation, its communication protocol is via Wi-Fi and they are compatible with Alexa and Google Home.
The range Sonoff es a simple and cheap way to domesticate the house. Normal options give us an almost infinite amount of combinations, especially if we consider the timing function and the scenes.
In addition to the usual and known relays, we have a lot of less known devices, such as switches, sockets, a sensor station, and an RF gateway that allows us to add many more sensors. Although we miss a thermostat and an IR gateway.
For the most daring users, it is possible to reprogram the devices with one of the firmware developed by the community, and integrate it with other Open Source developments (Home Assistant, your MQTT server).
Finally, we can also use these devices as a programmable processor(normally the relay) and include it in our electronics and robotics project.
Int.-Pul. 433 Mhz