I couldn’t find the required connection speed on their website other than in a Quick Start Guide where it says a wireless connection with at least three bars displayed is needed. If you can watch hi-def (720 or 1080) streaming video without interruption (buffering) on your PC you probably have sufficient speed.
I used it when my download speed was 5 to 7 Mbps and upload was .5 Mbps.
My present speed is 18 to 20 Mbps down and 1.30 to 1.65 Mbps up so I have no problems and use it to listen to talk radio and watch the kind of movies and TV I like.
Good luck...