..... Yes it is a simple setting. It defaults to On. I turned it Off since until now I have no devices that used wifi.
Until now? I hope that means you might be thinking about a DOT.
The Alexa/Echo family of devices (I am using the cheapest unit the DOT at $39).... can control several different traditional HA devices (maybe with a work-around ALL of them). But that is only one little part of what Alexa can do.
Even if no lighting HA products were connected to DOT..... it is still one heck of a bunch of automation.... much like we'd expect to see in a Star-Trek movie.
Many of the features with the DOT (Alexa/Echo family of devices) were thought of, and integrated into my BVC (and Homeseer) years ago. I am sure many realized the potential of voice control right from the imagination of Gene Rodenberry.... and the many versions of StarTrek shows and movies. These features stand by themselves.
Since this is a new product... the features/abilities might be hard for me to explain. And I would hate to represent this great product with my feeble commutation skills. Of course there are always
YouTube Videos like this one that demonstrate the echo. In that video the user when through several things easily done with my 2nd gen DOT (or any of the Alexa/Echo products). Many of the things he said/ask Alexa were out-of-the-box capabilities. Others require a brief setup in the app that is installed on a phone/tablet/PC (like ordering pizza, Uber, or items from Amazon).
There are many things that can be done.... called skills. For which you select an app in your skills selection... Then instruction Alexa to open that [app] to accomplish the task. Like the TV channel finder [skill-app] (whatever it's called)....... I would say Alexa ask TV Finder when the next episode of Snake Island is on. And Alexa would reply with the day, time, and channel. I can then ask Alexa to remind me when it comes on (I hate missing that show!).
I also like asking Alexa... how old is that singer... or how tall is that actress... or when was that movie made.