Yes there is. There are two buttons on the front, the one on the bottom is the wifi on/off button. You need to press and hold the button approximately 5 seconds turn it off or on.
I have wifi through Comcast but this device will save me lots of $ over time than their monthly fee. I don't know if you can use it without wifi...sorry, someone who knows more about tech stuff than I do suggested it and plugged it in very fast. It's working great so far.