Homey supports Wi-Fi devices manufactured by a wide range of brands. You can search for an associated app on the Homey App Store to see if your device is supported.
Adding Wi-Fi devices to Homey
To better understand the process of pairing new Wi-Fi devices with Homey, you can look at this tutorial.
Wi-Fi Range
The wireless range of Homey depends heavily on the technology you use to control devices.
Generally speaking, when using a 2.4GHz or 5GHz Wi-Fi connection, you can usually control your entire home using a single Homey placed in your living room and the device in other rooms or the garden.
Please remember that Homey uses your Wi-Fi network and is thus subject to its quirks. The exact range depends on the coverage of your network.