To control light and scene via Alexa, Add the light switch (Feedback Switch) extension of the Gateway or Scene in the S&S Hub App.After discovering the devices using Alexa, you can control all (Feedback Switch) extensions and scene easily. For example, after discovering the devices, say 'Alexa, turn on Hall light' if you have a extension device (Feedback Switch) and its room name is 'Hall light',then the hall light will turn on by the light switch (Feedback Switch).