The description is inconsistent and sometimes says this is 2.0 and in other places says it is 2.1. If it has a subwoofer as the title and picture show, it must be 2.1
This looks like a similar model that I saw on Woot about a week ago which sold out as I was looking at it. That one was the newer model with SmartCast (Google Cast). Upon further inspection this is an older model without that feature.